# How do you solve - 4sqrt(x + 9)=20?

Apr 13, 2018

$x = 16$

#### Explanation:

$- 4 \sqrt{x + 9}$ = 20

$\sqrt{x + 9}$ = $\frac{20}{-} 4$

$x + 9 = {\left(- 5\right)}^{2}$

$x = 25 - 9$

$x = 16$