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Math Help - Walkthrough Algebra Factoring

  1. #1
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    Walkthrough Algebra Factoring

    i checked a book out of the library entitled coles notes how to get an A in senior algebra, the very first chaptor is on factoring, so i assume that this belongs here, at the end of the chapter are a few questions pertainng to the chapter, one question that i am having trouble with is:

    ad-3bd-ab+3b^2+ac-3bc
    the anwser is (a-3b)(d-b+c)

    i need to know step-by-step how the book arrived at the anwser, so that i can solve similar equations myself.
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  2. #2
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    ad-3bd-ab+3b^2+ac-3bc

    ad-ab+ac+3b^2-3bd-3bc

    a(d-b+c)-3b(-b+d+c)

    a(d-b+c)-3b(d-b+c)

    (d-b+c)(a-3b)
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