Question

Solve for x.
$\sqrt{x+16} = x-4$

x = 0 or x = 9
x = 9
x = 8
no solution

Answer 1

The answer is x=9
Explanation: x + 16 = x^2 - 8x +16
x = x^2 - 8x
9x - x^2 = 0
X x (9-x) = 0

Answer 2

hint- start with just simple adding first!