Inactive Tutor answered • 03/15/17
Tutor
New to Wyzant
4X2 + 28X = 0
4X(X+7) = 0
either 4X = 0 or X+7 = 0
hence X = 0 or -7
check; 4(0)2 + 28(0) = 0 ; and 4(-7)2 + 28*7 = 196 - 196 = 0 (proven)
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