Find the Inverse square root of 2x-7

$\sqrt{2 x - 7}$

Step 1

Interchange the variables.

$x = \sqrt{2 y - 7}$

Step 2

Solve for $y$ .

Rewrite the equation as $\sqrt{2 y - 7} = x$ .

$\sqrt{2 y - 7} = x$

To remove the radical on the left side of the equation, square both sides of the equation.

${\sqrt{2 y - 7}}^{2} = x^{2}$

Simplify each side of the equation.

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{2 y - 7}$ as ${(2 y - 7)}^{\frac{1}{2}}$ .

${({(2 y - 7)}^{\frac{1}{2}})}^{2} = x^{2}$

Simplify the left side.

Simplify ${({(2 y - 7)}^{\frac{1}{2}})}^{2}$ .

Multiply the exponents in ${({(2 y - 7)}^{\frac{1}{2}})}^{2}$ .

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

${(2 y - 7)}^{\frac{1}{2} \cdot 2} = x^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

${(2 y - 7)}^{\frac{1}{2} \cdot 2} = x^{2}$

Rewrite the expression.

${(2 y - 7)}^{1} = x^{2}$

Simplify.

$2 y - 7 = x^{2}$

Solve for $y$ .

Add $7$ to both sides of the equation.

$2 y = x^{2} + 7$

Divide each term in $2 y = x^{2} + 7$ by $2$ and simplify.

Divide each term in $2 y = x^{2} + 7$ by $2$ .

$\frac{2 y}{2} = \frac{x^{2}}{2} + \frac{7}{2}$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 y}{2} = \frac{x^{2}}{2} + \frac{7}{2}$

Divide $y$ by $1$ .

$y = \frac{x^{2}}{2} + \frac{7}{2}$

Step 3

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

$f^{- 1} (x) = \frac{x^{2}}{2} + \frac{7}{2}$

Step 4

Verify if $f^{- 1} (x) = \frac{x^{2}}{2} + \frac{7}{2}$ is the inverse of $f (x) = \sqrt{2 x - 7}$ .

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 $f^{- 1} (\sqrt{2 x - 7})$ by substituting in the value of $f$ into $f^{- 1}$ .

$f^{- 1} (\sqrt{2 x - 7}) = \frac{{(\sqrt{2 x - 7})}^{2}}{2} + \frac{7}{2}$

Combine the numerators over the common denominator.

$f^{- 1} (\sqrt{2 x - 7}) = \frac{{(\sqrt{2 x - 7})}^{2} + 7}{2}$

Rewrite ${\sqrt{2 x - 7}}^{2}$ as $2 x - 7$ .

Use $\sqrt[n]{a^{x}} = a^{\frac{x}{n}}$ to rewrite $\sqrt{2 x - 7}$ as ${(2 x - 7)}^{\frac{1}{2}}$ .

$f^{- 1} (\sqrt{2 x - 7}) = \frac{{({(2 x - 7)}^{\frac{1}{2}})}^{2} + 7}{2}$

Apply the power rule and multiply exponents, ${(a^{m})}^{n} = a^{m n}$ .

$f^{- 1} (\sqrt{2 x - 7}) = \frac{{(2 x - 7)}^{\frac{1}{2} \cdot 2} + 7}{2}$

Combine $\frac{1}{2}$ and $2$ .

$f^{- 1} (\sqrt{2 x - 7}) = \frac{{(2 x - 7)}^{\frac{2}{2}} + 7}{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

$f^{- 1} (\sqrt{2 x - 7}) = \frac{{(2 x - 7)}^{\frac{2}{2}} + 7}{2}$

Rewrite the expression.

$f^{- 1} (\sqrt{2 x - 7}) = \frac{(2 x - 7) + 7}{2}$

Simplify.

$f^{- 1} (\sqrt{2 x - 7}) = \frac{2 x - 7 + 7}{2}$

Simplify terms.

Combine the opposite terms in $2 x - 7 + 7$ .

Add $- 7$ and $7$ .

$f^{- 1} (\sqrt{2 x - 7}) = \frac{2 x + 0}{2}$

Add $2 x$ and $0$ .

$f^{- 1} (\sqrt{2 x - 7}) = \frac{2 x}{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

$f^{- 1} (\sqrt{2 x - 7}) = \frac{2 x}{2}$

Divide $x$ by $1$ .

$f^{- 1} (\sqrt{2 x - 7}) = x$

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

Set up the composite result function.

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

Evaluate $f (\frac{x^{2}}{2} + \frac{7}{2})$ by substituting in the value of $f^{- 1}$ into $f$ .

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{2 (\frac{x^{2}}{2} + \frac{7}{2}) - 7}$

Apply the distributive property.

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{2 (\frac{x^{2}}{2}) + 2 (\frac{7}{2}) - 7}$

Cancel the common factor of $2$ .

Cancel the common factor.

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{2 (\frac{x^{2}}{2}) + 2 (\frac{7}{2}) - 7}$

Rewrite the expression.

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{x^{2} + 2 (\frac{7}{2}) - 7}$

Cancel the common factor of $2$ .

Cancel the common factor.

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{x^{2} + 2 (\frac{7}{2}) - 7}$

Rewrite the expression.

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{x^{2} + 7 - 7}$

Simplify by subtracting numbers.

Subtract $7$ from $7$ .

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{x^{2} + 0}$

Add $x^{2}$ and $0$ .

$f (\frac{x^{2}}{2} + \frac{7}{2}) = \sqrt{x^{2}}$

Pull terms out from under the radical, assuming positive real numbers.

$f (\frac{x^{2}}{2} + \frac{7}{2}) = x$

Since $f^{- 1} (f (x)) = x$ and $f (f^{- 1} (x)) = x$ , then $f^{- 1} (x) = \frac{x^{2}}{2} + \frac{7}{2}$ is the inverse of $f (x) = \sqrt{2 x - 7}$ .

$f^{- 1} (x) = \frac{x^{2}}{2} + \frac{7}{2}$

Find the Inverse square root of 2x-7

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