Solve Using the Square Root Property x^2-15=110

$x^{2} - 15 = 110$

Step 1

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

Add $15$ to both sides of the equation.

$x^{2} = 110 + 15$

Add $110$ and $15$ .

$x^{2} = 125$

Step 2

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

$x = \pm \sqrt{125}$

Step 3

Simplify $\pm \sqrt{125}$ .

Rewrite $125$ as $5^{2} \cdot 5$ .

Factor $25$ out of $125$ .

$x = \pm \sqrt{25 (5)}$

Rewrite $25$ as $5^{2}$ .

$x = \pm \sqrt{5^{2} \cdot 5}$

Pull terms out from under the radical.

$x = \pm 5 \sqrt{5}$

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.

$x = 5 \sqrt{5}$

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

$x = - 5 \sqrt{5}$

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

$x = 5 \sqrt{5}, - 5 \sqrt{5}$

Step 5

The result can be shown in multiple forms.

Exact Form:

$x = 5 \sqrt{5}, - 5 \sqrt{5}$

Decimal Form:

$x = 11.18033988 \dots, - 11.18033988 \dots$