Solve Using the Square Root Property (5y+2)^2-80=0

${(5 y + 2)}^{2} - 80 = 0$

Step 1

Add $80$ to both sides of the equation.

${(5 y + 2)}^{2} = 80$

Step 2

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

$5 y + 2 = \pm \sqrt{80}$

Step 3

Simplify $\pm \sqrt{80}$ .

Rewrite $80$ as $4^{2} \cdot 5$ .

Factor $16$ out of $80$ .

$5 y + 2 = \pm \sqrt{16 (5)}$

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

$5 y + 2 = \pm \sqrt{4^{2} \cdot 5}$

Pull terms out from under the radical.

$5 y + 2 = \pm 4 \sqrt{5}$

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.

$5 y + 2 = 4 \sqrt{5}$

Subtract $2$ from both sides of the equation.

$5 y = 4 \sqrt{5} - 2$

Divide each term in $5 y = 4 \sqrt{5} - 2$ by $5$ and simplify.

Divide each term in $5 y = 4 \sqrt{5} - 2$ by $5$ .

$\frac{5 y}{5} = \frac{4 \sqrt{5}}{5} + \frac{- 2}{5}$

Simplify the left side.

Cancel the common factor of $5$ .

Cancel the common factor.

$\frac{5 y}{5} = \frac{4 \sqrt{5}}{5} + \frac{- 2}{5}$

Divide $y$ by $1$ .

$y = \frac{4 \sqrt{5}}{5} + \frac{- 2}{5}$

Simplify the right side.

Move the negative in front of the fraction.

$y = \frac{4 \sqrt{5}}{5} - \frac{2}{5}$

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

$5 y + 2 = - 4 \sqrt{5}$

Subtract $2$ from both sides of the equation.

$5 y = - 4 \sqrt{5} - 2$

Divide each term in $5 y = - 4 \sqrt{5} - 2$ by $5$ and simplify.

Divide each term in $5 y = - 4 \sqrt{5} - 2$ by $5$ .

$\frac{5 y}{5} = \frac{- 4 \sqrt{5}}{5} + \frac{- 2}{5}$

Simplify the left side.

Cancel the common factor of $5$ .

Cancel the common factor.

$\frac{5 y}{5} = \frac{- 4 \sqrt{5}}{5} + \frac{- 2}{5}$

Divide $y$ by $1$ .

$y = \frac{- 4 \sqrt{5}}{5} + \frac{- 2}{5}$

Simplify the right side.

Simplify each term.

Move the negative in front of the fraction.

$y = - \frac{4 \sqrt{5}}{5} + \frac{- 2}{5}$

Move the negative in front of the fraction.

$y = - \frac{4 \sqrt{5}}{5} - \frac{2}{5}$

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

$y = \frac{4 \sqrt{5}}{5} - \frac{2}{5}, - \frac{4 \sqrt{5}}{5} - \frac{2}{5}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$y = \frac{4 \sqrt{5}}{5} - \frac{2}{5}, - \frac{4 \sqrt{5}}{5} - \frac{2}{5}$

Decimal Form:

$y = 1.38885438 \dots, - 2.18885438 \dots$

Solve Using the Square Root Property (5y+2)^2-80=0

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