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Factor out the GCF, then solve the following expression.

3x² + 21x = 0

A {0, 24}

B {-7, 3}

C {0, 7}

D {-7, 0}

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Answers (2)
  1. 23 May, 13:23
    0
    D {-7, 0}

    Step-by-step explanation:

    The GCF is 3x

    3x (x+7) = 0

    x = {-7, 0}
  2. 23 May, 13:37
    0
    D {-7, 0}

    Step-by-step explanation:

    3x^2 = 3*x*x

    21x = 3*7*x

    The greatest common factor is 3x

    3x (x+7) = 0

    Using the zero product property

    3x=0 x+7 = 0

    x=0 x+7-7 = 0-7

    x=0 x=-7
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