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21 January, 17:21

Solve x2 + 7x + 12 = 0 for x

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Answers (2)
  1. 21 January, 18:53
    0
    x^2 + 7x + 12 = 0

    We know that 4 times 3 is 12.

    We also know that 4 plus 3 is 7.

    This is all we need to know to create our two factors.

    (x + 3) (x + 4) = 0

    Set each factor to 0 and solve for x.

    x + 3 = 0

    x = - 3

    x + 4 = 0

    x = - 4

    Answer: x = - 3, x = - 4
  2. 21 January, 21:13
    0
    -4/3

    Step-by-step explanation:

    Isolate x.

    x2 + 7x + 12 = 0

    2x + 7x + 12 = 0

    9x + 12 = 0

    9x = - 12

    x = - 12/9

    x = - 4/3
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