Question

Solve by using the perfect squares method.

x2 + 16x + 64= 0

A.
8

B.
16

C.
–8

D.
–16

Answer 1

C -8

Answer 2

(x+8)^2=0
sqrt{(x+8)^2}=sqrt{0}
x+8=0
x=-8

Answer 3

Any guess what would be first step ??

Answer 4

use the quadratic formula and plug in the numbers that replaces ax^2+bx+c=0
as x^2 + 16x + 64= 0
so a=1 b=16 and c=64

quadratic formula
\[x=\frac{ -b \pm \sqrt{b^2-4ac} }{ 2a }\]

now plug and chug!