Solve for x (x-4)^(2/3)=9

${(x - 4)}^{\frac{2}{3}} = 9$

Step 1

Raise each side of the equation to the power of $\frac{3}{2}$ to eliminate the fractional exponent on the left side.

${({(x - 4)}^{\frac{2}{3}})}^{\frac{3}{2}} = \pm 9^{\frac{3}{2}}$

Step 2

Simplify the exponent.

Simplify the left side.

Simplify ${({(x - 4)}^{\frac{2}{3}})}^{\frac{3}{2}}$ .

Multiply the exponents in ${({(x - 4)}^{\frac{2}{3}})}^{\frac{3}{2}}$ .

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

${(x - 4)}^{\frac{2}{3} \cdot \frac{3}{2}} = \pm 9^{\frac{3}{2}}$

Cancel the common factor of $2$ .

Cancel the common factor.

${(x - 4)}^{\frac{2}{3} \cdot \frac{3}{2}} = \pm 9^{\frac{3}{2}}$

Rewrite the expression.

${(x - 4)}^{\frac{1}{3} \cdot 3} = \pm 9^{\frac{3}{2}}$

Cancel the common factor of $3$ .

Cancel the common factor.

${(x - 4)}^{\frac{1}{3} \cdot 3} = \pm 9^{\frac{3}{2}}$

Rewrite the expression.

${(x - 4)}^{1} = \pm 9^{\frac{3}{2}}$

Simplify.

$x - 4 = \pm 9^{\frac{3}{2}}$

Simplify the right side.

Simplify $\pm 9^{\frac{3}{2}}$ .

Simplify the expression.

Rewrite $9$ as $3^{2}$ .

$x - 4 = \pm {(3^{2})}^{\frac{3}{2}}$

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

$x - 4 = \pm 3^{2 (\frac{3}{2})}$

Cancel the common factor of $2$ .

Cancel the common factor.

$x - 4 = \pm 3^{2 (\frac{3}{2})}$

Rewrite the expression.

$x - 4 = \pm 3^{3}$

Raise $3$ to the power of $3$ .

$x - 4 = \pm 27$

Step 3

The complete solution is the result of both the positive and negative portions of the solution.

First, use the positive value of the $\pm$ to find the first solution.

$x - 4 = 27$

Move all terms not containing $x$ to the right side of the equation.

Add $4$ to both sides of the equation.

$x = 27 + 4$

Add $27$ and $4$ .

$x = 31$

Next, use the negative value of the $\pm$ to find the second solution.

$x - 4 = - 27$

Move all terms not containing $x$ to the right side of the equation.

Add $4$ to both sides of the equation.

$x = - 27 + 4$

Add $- 27$ and $4$ .

$x = - 23$

The complete solution is the result of both the positive and negative portions of the solution.

$x = 31, - 23$

Solve for x (x-4)^(2/3)=9

Related Questions

Support LCMGCF.com by disabling your adblocker.