Solve for I 13=2 square root of I-9

$13 = 2 \sqrt{I} - 9$

Rewrite the equation as $2 \sqrt{I} - 9 = 13$ .

$2 \sqrt{I} - 9 = 13$

Move all terms not containing $2 \sqrt{I}$ to the right side of the equation.

Add $9$ to both sides of the equation.

$2 \sqrt{I} = 13 + 9$

Add $13$ and $9$ .

$2 \sqrt{I} = 22$

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

${(2 \sqrt{I})}^{2} = 22^{2}$

Simplify each side of the equation.

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

${(2 I^{\frac{1}{2}})}^{2} = 22^{2}$

Simplify the left side.

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

Apply the product rule to $2 I^{\frac{1}{2}}$ .

$2^{2} {(I^{\frac{1}{2}})}^{2} = 22^{2}$

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

$4 {(I^{\frac{1}{2}})}^{2} = 22^{2}$

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

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

$4 I^{\frac{1}{2} \cdot 2} = 22^{2}$

Cancel the common factor of $2$ .

Cancel the common factor.

$4 I^{\frac{1}{2} \cdot 2} = 22^{2}$

Rewrite the expression.

$4 I^{1} = 22^{2}$

Simplify.

$4 I = 22^{2}$

Simplify the right side.

Raise $22$ to the power of $2$ .

$4 I = 484$

Divide each term in $4 I = 484$ by $4$ and simplify.

Divide each term in $4 I = 484$ by $4$ .

$\frac{4 I}{4} = \frac{484}{4}$

Simplify the left side.

Cancel the common factor of $4$ .

Cancel the common factor.

$\frac{4 I}{4} = \frac{484}{4}$

Divide $I$ by $1$ .

$I = \frac{484}{4}$

Simplify the right side.

Divide $484$ by $4$ .

$I = 121$