ShadowWolf18 ShadowWolf18

25-10-2016
Mathematics

contestada

What are the solutions of the equation x2 +4x+4=25?

A. x=3 or x=-7
B. x=-3 or x= -7
C. x=1 or x=9
D. x=1 or x=-9

Respuesta :

lovingthefallen lovingthefallen

25-10-2016

The answer is :A. x=3 or x=-7

Answer Link

apologiabiology apologiabiology

25-10-2016

minus 25 oth sides
x^2+4x-21
facotr
what 2 numbes multiply to -21 and add to 4?
-3 and 7
(x-3)(x+7)=0

set to zero
x-3=0
x=3

x+7=0
x=-7

x=3 or -7

A is answer

Answer Link

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