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label Mathematics
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Solve by using the perfect squares method.

x2 + 8x + 16 = 0

 A. 2
 B.  –2
 C. 4
 D. –4

Apr 24th, 2015

x^2+8x+16=0

x^2 + 2*4*x + 4^2 = 0

(x + 4)^2 = 0            (because (a+b)^2=a^2+2ab+b^2) 

x + 4 = 0

x = -4


ANSWER:

D    -4

Apr 24th, 2015

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