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Math Help - Factoring polynomial help please

  1. #1
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    Factoring polynomial help please

    Here it is.

    ab+2b-4a-8

    Thanks

    the answer given is (a+2)(b-4) but not sure how to get it.
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by MathMack View Post
    Here it is.

    ab+2b-4a-8

    Thanks

    the answer given is (a+2)(b-4) but not sure how to get it.
    Factor out b, out of the first two terms.
    Factor out -4 out of the last two terms.

    b(a + 2) - 4(a + 2)

    = (b - 4)(a + 2)
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