Solve for y y^2+16=0

$y^{2} + 16 = 0$

Step 1

Subtract $16$ from both sides of the equation.

$y^{2} = - 16$

Step 2

Take the specified root of both sides of the equation to eliminate the exponent on the left side.

$y = \pm \sqrt{- 16}$

Step 3

Simplify $\pm \sqrt{- 16}$ .

Rewrite $- 16$ as $- 1 (16)$ .

$y = \pm \sqrt{- 1 (16)}$

Rewrite $\sqrt{- 1 (16)}$ as $\sqrt{- 1} \cdot \sqrt{16}$ .

$y = \pm \sqrt{- 1} \cdot \sqrt{16}$

Rewrite $\sqrt{- 1}$ as $i$ .

$y = \pm i \cdot \sqrt{16}$

Rewrite $16$ as $4^{2}$ .

$y = \pm i \cdot \sqrt{4^{2}}$

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

$y = \pm i \cdot 4$

Move $4$ to the left of $i$ .

$y = \pm 4 i$

Step 4

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.

$y = 4 i$

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

$y = - 4 i$

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

$y = 4 i, - 4 i$