Find the Inverse 9x+8

$9 x + 8$

Step 1

Interchange the variables.

$x = 9 y + 8$

Step 2

Solve for $y$ .

Rewrite the equation as $9 y + 8 = x$ .

$9 y + 8 = x$

Subtract $8$ from both sides of the equation.

$9 y = x - 8$

Divide each term in $9 y = x - 8$ by $9$ and simplify.

Divide each term in $9 y = x - 8$ by $9$ .

$\frac{9 y}{9} = \frac{x}{9} + \frac{- 8}{9}$

Simplify the left side.

Cancel the common factor of $9$ .

Cancel the common factor.

$\frac{9 y}{9} = \frac{x}{9} + \frac{- 8}{9}$

Divide $y$ by $1$ .

$y = \frac{x}{9} + \frac{- 8}{9}$

Simplify the right side.

Move the negative in front of the fraction.

$y = \frac{x}{9} - \frac{8}{9}$

Step 3

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

$f^{- 1} (x) = \frac{x}{9} - \frac{8}{9}$

Step 4

Verify if $f^{- 1} (x) = \frac{x}{9} - \frac{8}{9}$ is the inverse of $f (x) = 9 x + 8$ .

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

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

Set up the composite result function.

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

Evaluate $f^{- 1} (9 x + 8)$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (9 x + 8) = \frac{9 x + 8}{9} - \frac{8}{9}$

Combine the numerators over the common denominator.

$f^{- 1} (9 x + 8) = \frac{9 x + 8 - 8}{9}$

Combine the opposite terms in $9 x + 8 - 8$ .

Subtract $8$ from $8$ .

$f^{- 1} (9 x + 8) = \frac{9 x + 0}{9}$

Add $9 x$ and $0$ .

$f^{- 1} (9 x + 8) = \frac{9 x}{9}$

Cancel the common factor of $9$ .

Cancel the common factor.

$f^{- 1} (9 x + 8) = \frac{9 x}{9}$

Divide $x$ by $1$ .

$f^{- 1} (9 x + 8) = x$

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

Set up the composite result function.

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

Evaluate $f (\frac{x}{9} - \frac{8}{9})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (\frac{x}{9} - \frac{8}{9}) = 9 (\frac{x}{9} - \frac{8}{9}) + 8$

Simplify each term.

Apply the distributive property.

$f (\frac{x}{9} - \frac{8}{9}) = 9 (\frac{x}{9}) + 9 (- \frac{8}{9}) + 8$

Cancel the common factor of $9$ .

Cancel the common factor.

$f (\frac{x}{9} - \frac{8}{9}) = 9 (\frac{x}{9}) + 9 (- \frac{8}{9}) + 8$

Rewrite the expression.

$f (\frac{x}{9} - \frac{8}{9}) = x + 9 (- \frac{8}{9}) + 8$

Cancel the common factor of $9$ .

Move the leading negative in $- \frac{8}{9}$ into the numerator.

$f (\frac{x}{9} - \frac{8}{9}) = x + 9 (\frac{- 8}{9}) + 8$

Cancel the common factor.

$f (\frac{x}{9} - \frac{8}{9}) = x + 9 (\frac{- 8}{9}) + 8$

Rewrite the expression.

$f (\frac{x}{9} - \frac{8}{9}) = x - 8 + 8$

Combine the opposite terms in $x - 8 + 8$ .

Add $- 8$ and $8$ .

$f (\frac{x}{9} - \frac{8}{9}) = x + 0$

Add $x$ and $0$ .

$f (\frac{x}{9} - \frac{8}{9}) = x$

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = \frac{x}{9} - \frac{8}{9}$ is the inverse of $f (x) = 9 x + 8$ .

$f^{- 1} (x) = \frac{x}{9} - \frac{8}{9}$

Find the Inverse 9x+8

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