How do you solve $- 4 \sqrt{x + 9} = 20$ $- 4sqrt(x + 9)=20$ ?

Question

1881 views around the world

You can reuse this answer
Creative Commons License

Answer 1 · 2018-04-13T11:17:48

$x = 16$ $x=16$

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

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

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

$x = 25 - 9$ $x=25-9$

$x = 16$ $x=16$

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