Solve for r square root of r=12

$\sqrt{r} = 12$

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

${\sqrt{r}}^{2} = 12^{2}$

Simplify each side of the equation.

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

${(r^{\frac{1}{2}})}^{2} = 12^{2}$

Simplify the left side.

Simplify ${(r^{\frac{1}{2}})}^{2}$ .

Multiply the exponents in ${(r^{\frac{1}{2}})}^{2}$ .

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

$r^{\frac{1}{2} \cdot 2} = 12^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

$r^{\frac{1}{2} \cdot 2} = 12^{2}$

Rewrite the expression.

$r^{1} = 12^{2}$

Simplify.

$r = 12^{2}$

Simplify the right side.

Raise $12$ to the power of $2$ .

$r = 144$