Solve Using the Square Root Property (2y+4)^2=16

${(2 y + 4)}^{2} = 16$

Step 1

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

$2 y + 4 = \pm \sqrt{16}$

Step 2

Simplify $\pm \sqrt{16}$ .

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

$2 y + 4 = \pm \sqrt{4^{2}}$

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

$2 y + 4 = \pm 4$

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.

$2 y + 4 = 4$

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

Subtract $4$ from both sides of the equation.

$2 y = 4 - 4$

Subtract $4$ from $4$ .

$2 y = 0$

Divide each term in $2 y = 0$ by $2$ and simplify.

Divide each term in $2 y = 0$ by $2$ .

$\frac{2 y}{2} = \frac{0}{2}$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 y}{2} = \frac{0}{2}$

Divide $y$ by $1$ .

$y = \frac{0}{2}$

Simplify the right side.

Divide $0$ by $2$ .

$y = 0$

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

$2 y + 4 = - 4$

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

Subtract $4$ from both sides of the equation.

$2 y = - 4 - 4$

Subtract $4$ from $- 4$ .

$2 y = - 8$

Divide each term in $2 y = - 8$ by $2$ and simplify.

Divide each term in $2 y = - 8$ by $2$ .

$\frac{2 y}{2} = \frac{- 8}{2}$

Simplify the left side.

Cancel the common factor of $2$ .

Cancel the common factor.

$\frac{2 y}{2} = \frac{- 8}{2}$

Divide $y$ by $1$ .

$y = \frac{- 8}{2}$

Simplify the right side.

Divide $- 8$ by $2$ .

$y = - 4$

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

$y = 0, - 4$

Solve Using the Square Root Property (2y+4)^2=16

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