SOLUTION: 6. Solve the quadratic equation x2 + 16x = -64 by factoring. A. {2, 4} B. 8 C. {-8, 8} D. -8

Algebra ->  Quadratic Equations and Parabolas -> SOLUTION: 6. Solve the quadratic equation x2 + 16x = -64 by factoring. A. {2, 4} B. 8 C. {-8, 8} D. -8       Log On


   

Question 798449: 6.
Solve the quadratic equation x2 + 16x = -64 by factoring.

A. {2, 4}
B. 8
C. {-8, 8}
D. -8

Answer by nerdybill(7384) About Me  (Show Source):
You can put this solution on YOUR website!
x2 + 16x = -64
x2 + 16x + 64 = 0
Find two numbers that multiplies to give you 64 and combined to give you 16:
(x+8)(x+8) = 0
.
solution:
x = -8 (answer D)