SOLUTION: 3x2 +18x + 21= x(x + 5)

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Question 313951: 3x2 +18x + 21= x(x + 5)
Answer by checkley77(12844) About Me  (Show Source):
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3x^2 +18x + 21= x(x + 5)
3x^2+18x+21=x^2+5x
3x^2-x^2+18x-5x+21=0
2x^2+13x+21=0
(2x+7)(x+3)=0
2x+7=0
2x=-7
x=-3.5 ans.
x+3=0
x=-3 ans.