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16 May, 08:39

How do I solve 12x^2-89x-56 factor by grouping

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  1. 16 May, 08:57
    0
    Use ac method

    multiply 12 and - 56

    -672

    now find what 2 factors of - 672 add to - 89

    answer is - 96 and 7

    expand the middle term like that

    12x²-96x+7x-56

    group

    (12x²-96x) + (7x-56)

    factor

    12x (x-8) + 7 (x-8)

    undistribute the (x-8)

    (x-8) (12x+7) is answer
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