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2 March, 02:03

Check my answer!

Factor completely: 6x2 - 12x - 18.

A. 3 (2x + 3) (x - 1)

B. (3x + 3) (3x - 3)

C. 6 (x + 1) (x - 3)

D. 6 (x - 1) (x - 3)

The answer would have to be C. or D.

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Answers (1)
  1. 2 March, 02:43
    0
    Factor out a 6

    6 / 6x^2 = x^2

    6 / - 12x = - 2x

    6 / - 18 = - 3

    6 (x^2 - 2x - 3)

    Multiply the first term to the last

    1 x - 3 = - 3

    (a x b) = - 3

    (a + b) = - 2 (middle term)

    (1 x - 3) = - 3

    (1 + - 3) = - 2

    Plug them in by replacing - 2x and simplify

    6 (x^2 - 1x - 3x - 3)

    6 ((x^2 - 1x) - (3x - 3))

    6 (x (x - 1) - 3 (x - 1))

    6 (x - 3) (x - 1)

    Or in this case, 6 (x - 1) (x - 3)
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