Find the Inverse f(x)=b(x+a)^3+c

$f (x) = b {(x + a)}^{3} + c$

Step 1

Write $f (x) = b {(x + a)}^{3} + c$ as an equation.

$y = b {(x + a)}^{3} + c$

Step 2

Interchange the variables.

$b = y {(x + a)}^{3} + c$

Step 3

Solve for $y$ .

Rewrite the equation as $y {(x + a)}^{3} + c = b$ .

$y {(x + a)}^{3} + c = b$

Subtract $c$ from both sides of the equation.

$y {(x + a)}^{3} = b - c$

Divide each term in $y {(x + a)}^{3} = b - c$ by ${(x + a)}^{3}$ and simplify.

Divide each term in $y {(x + a)}^{3} = b - c$ by ${(x + a)}^{3}$ .

$\frac{y {(x + a)}^{3}}{{(x + a)}^{3}} = \frac{b}{{(x + a)}^{3}} + \frac{- c}{{(x + a)}^{3}}$

Simplify the left side.

Cancel the common factor of ${(x + a)}^{3}$ .

Cancel the common factor.

$\frac{y {(x + a)}^{3}}{{(x + a)}^{3}} = \frac{b}{{(x + a)}^{3}} + \frac{- c}{{(x + a)}^{3}}$

Divide $y$ by $1$ .

$y = \frac{b}{{(x + a)}^{3}} + \frac{- c}{{(x + a)}^{3}}$

Simplify the right side.

Move the negative in front of the fraction.

$y = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 4

Replace $y$ with $f^{- 1} (b)$ to show the final answer.

$f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Step 5

Verify if $f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$ is the inverse of $f (b) = b {(x + a)}^{3} + c$ .

To verify the inverse, check if $f^{- 1} (f (b)) = b$ and $f (f^{- 1} (b)) = b$ .

Evaluate $f^{- 1} (f (b))$ .

Set up the composite result function.

$f^{- 1} (f (b))$

Evaluate $f^{- 1} (b {(x + a)}^{3} + c)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b {(x + a)}^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Simplify the numerator.

Use the Binomial Theorem.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (x^{3} + 3 x^{2} a + 3 x a^{2} + a^{3}) + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Apply the distributive property.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + b (3 x^{2} a) + b (3 x a^{2}) + b a^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Simplify.

Rewrite using the commutative property of multiplication.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + b (3 x a^{2}) + b a^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Rewrite using the commutative property of multiplication.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Simplify terms.

Combine the numerators over the common denominator.

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + c - c}{{(a + x)}^{3}}$

Combine the opposite terms in $b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + c - c$ .

Subtract $c$ from $c$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3} + 0}{{(a + x)}^{3}}$

Add $b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3}$ and $0$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b x^{2} a + 3 b x a^{2} + b a^{3}}{{(a + x)}^{3}}$

Simplify the expression.

Move $x^{2}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 b a x^{2} + 3 b x a^{2} + b a^{3}}{{(a + x)}^{3}}$

Move $b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 b x a^{2} + b a^{3}}{{(a + x)}^{3}}$

Move $x$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 b a^{2} x + b a^{3}}{{(a + x)}^{3}}$

Move $b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 a^{2} b x + b a^{3}}{{(a + x)}^{3}}$

Reorder $b$ and $a^{3}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b x^{3} + 3 a b x^{2} + 3 a^{2} b x + a^{3} b}{{(a + x)}^{3}}$

Move $b x^{3}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{3 a b x^{2} + 3 a^{2} b x + a^{3} b + b x^{3}}{{(a + x)}^{3}}$

Move $3 a b x^{2}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{3 a^{2} b x + a^{3} b + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Reorder $3 a^{2} b x$ and $a^{3} b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{a^{3} b + 3 a^{2} b x + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Factor $b$ out of $a^{3} b + 3 a^{2} b x + 3 a b x^{2} + b x^{3}$ .

Factor $b$ out of $a^{3} b$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + 3 a^{2} b x + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Factor $b$ out of $3 a^{2} b x$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + b (3 a^{2} x) + 3 a b x^{2} + b x^{3}}{{(a + x)}^{3}}$

Factor $b$ out of $3 a b x^{2}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + b (3 a^{2} x) + b (3 a x^{2}) + b x^{3}}{{(a + x)}^{3}}$

Factor $b$ out of $b x^{3}$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b a^{3} + b (3 a^{2} x) + b (3 a x^{2}) + b (x^{3})}{{(a + x)}^{3}}$

Factor $b$ out of $b a^{3} + b (3 a^{2} x)$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (a^{3} + 3 a^{2} x) + b (3 a x^{2}) + b (x^{3})}{{(a + x)}^{3}}$

Factor $b$ out of $b (a^{3} + 3 a^{2} x) + b (3 a x^{2})$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (a^{3} + 3 a^{2} x + 3 a x^{2}) + b (x^{3})}{{(a + x)}^{3}}$

Factor $b$ out of $b (a^{3} + 3 a^{2} x + 3 a x^{2}) + b (x^{3})$ .

$f^{- 1} (b {(x + a)}^{3} + c) = \frac{b (a^{3} + 3 a^{2} x + 3 a x^{2} + x^{3})}{{(a + x)}^{3}}$

Evaluate $f (f^{- 1} (b))$ .

Set up the composite result function.

$f (f^{- 1} (b))$

Evaluate $f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) {(x + a)}^{3} + c$

Simplify each term.

Use the Binomial Theorem.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) (x^{3} + 3 x^{2} a + 3 x a^{2} + a^{3}) + c$

Expand $(\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) (x^{3} + 3 x^{2} a + 3 x a^{2} + a^{3})$ by multiplying each term in the first expression by each term in the second expression.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b}{{(x + a)}^{3}} \cdot x^{3} + \frac{b}{{(x + a)}^{3}} \cdot (3 x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Simplify each term.

Combine $\frac{b}{{(x + a)}^{3}}$ and $x^{3}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot (3 x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Rewrite using the commutative property of multiplication.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + 3 (\frac{b}{{(x + a)}^{3}}) \cdot (x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $3$ and $\frac{b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 b}{{(x + a)}^{3}} \cdot (x^{2} a) + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Multiply $\frac{3 b}{{(x + a)}^{3}} (x^{2} a)$ .

Combine $x^{2}$ and $\frac{3 b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{x^{2} (3 b)}{{(x + a)}^{3}} \cdot a + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $\frac{x^{2} (3 b)}{{(x + a)}^{3}}$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{x^{2} (3 b) a}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Move $3$ to the left of $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 \cdot (x^{2} b a)}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot (3 x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Rewrite using the commutative property of multiplication.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + 3 (\frac{b}{{(x + a)}^{3}}) \cdot (x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $3$ and $\frac{b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 b}{{(x + a)}^{3}} \cdot (x a^{2}) + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Multiply $\frac{3 b}{{(x + a)}^{3}} (x a^{2})$ .

Combine $x$ and $\frac{3 b}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{x (3 b)}{{(x + a)}^{3}} \cdot a^{2} + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $\frac{x (3 b)}{{(x + a)}^{3}}$ and $a^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{x (3 b) a^{2}}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Move $3$ to the left of $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 \cdot (x b a^{2})}{{(x + a)}^{3}} + \frac{b}{{(x + a)}^{3}} \cdot a^{3} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $\frac{b}{{(x + a)}^{3}}$ and $a^{3}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot x^{3} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $x^{3}$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Multiply $- \frac{c}{{(x + a)}^{3}} (3 x^{2} a)$ .

Multiply $3$ by $- 1$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - 3 \frac{c}{{(x + a)}^{3}} \cdot (x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $- 3$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{- 3 c}{{(x + a)}^{3}} \cdot (x^{2} a) - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $x^{2}$ and $\frac{- 3 c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{x^{2} (- 3 c)}{{(x + a)}^{3}} \cdot a - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $\frac{x^{2} (- 3 c)}{{(x + a)}^{3}}$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{x^{2} (- 3 c) a}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Remove unnecessary parentheses.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{x^{2} \cdot (- 3 c a)}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Move $- 3$ to the left of $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} + \frac{- 3 \cdot (x^{2} c a)}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Move the negative in front of the fraction.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{(3) \cdot (x^{2} c a)}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot (3 x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Multiply $- \frac{c}{{(x + a)}^{3}} (3 x a^{2})$ .

Multiply $3$ by $- 1$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - 3 \frac{c}{{(x + a)}^{3}} \cdot (x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $- 3$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{- 3 c}{{(x + a)}^{3}} \cdot (x a^{2}) - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $x$ and $\frac{- 3 c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{x (- 3 c)}{{(x + a)}^{3}} \cdot a^{2} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $\frac{x (- 3 c)}{{(x + a)}^{3}}$ and $a^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{x (- 3 c) a^{2}}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Remove unnecessary parentheses.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{x \cdot (- 3 c a^{2})}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Move $- 3$ to the left of $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} + \frac{- 3 \cdot (x c a^{2})}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Move the negative in front of the fraction.

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{(3) \cdot (x c a^{2})}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}} \cdot a^{3} + c$

Combine $a^{3}$ and $\frac{c}{{(x + a)}^{3}}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(x + a)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Simplify the expression.

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 x^{2} b a}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 b a x^{2}}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $b$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(x + a)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 x b a^{2}}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 b a^{2} x}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $b$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(x + a)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{b a^{3}}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $b$ and $a^{3}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(x + a)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{x^{3} c}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x^{3}$ and $c$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(x + a)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 x^{2} c a}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $x^{2}$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 c a x^{2}}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $c$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(x + a)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 x c a^{2}}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $x$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 c a^{2} x}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Move $c$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 a^{2} c x}{{(x + a)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 a^{2} c x}{{(a + x)}^{3}} - \frac{a^{3} c}{{(x + a)}^{3}} + c$

Reorder $x$ and $a$ .

$f (\frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}) = \frac{b x^{3}}{{(a + x)}^{3}} + \frac{3 a b x^{2}}{{(a + x)}^{3}} + \frac{3 a^{2} b x}{{(a + x)}^{3}} + \frac{a^{3} b}{{(a + x)}^{3}} - \frac{c x^{3}}{{(a + x)}^{3}} - \frac{3 a c x^{2}}{{(a + x)}^{3}} - \frac{3 a^{2} c x}{{(a + x)}^{3}} - \frac{a^{3} c}{{(a + x)}^{3}} + c$

Since $f^{- 1} (f (b)) = b$ and $f (f^{- 1} (b)) = b$ , then $f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$ is the inverse of $f (b) = b {(x + a)}^{3} + c$ .

$f^{- 1} (b) = \frac{b}{{(x + a)}^{3}} - \frac{c}{{(x + a)}^{3}}$

Find the Inverse f(x)=b(x+a)^3+c

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