Question

Solve: (x + 5)^2 = 16
A. -1, -9
B. -1, 9
C. 1, -9
D. 1, 9

Answer 1

If you multiply (x+5) by (x+5) then you get x^2+10x+25 = 16

Set it equal to 0:
0 = x^2+10x+9

This will factor down to:
(x+9)(x+1)

Which makes the solutions:
x=-9 and x=-1