# How do you solve using the square root method x^2 + 5 = 86?

Apr 14, 2016

$x = \pm 9$

#### Explanation:

To solve ${x}^{2} + 5 = 86$

We begin by isolating the term with $x$ by subtracting $5$ from both sides of the equation.

${x}^{2} \cancel{+ 5} \cancel{- 5} = 86 - 5$

We get

${x}^{2} = 81$

Now we square root both sides to eliminate the square of $x$

$\sqrt{{x}^{2}} = \sqrt{81}$

We get

$x = \pm 9$