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Math Help - I need to know how to factor this

  1. #1
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    I need to know how to factor this

    I don't know how to factor these four terms. I know factoring is all about finding factors but I need help to find out where that 3+x comes from and how can I do it.
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  2. #2
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    Quote Originally Posted by Alienis Back View Post
    I don't know how to factor these four terms. I know factoring is all about finding factors but I need help to find out where that 3+x comes from and how can I do it.
    x^3 + 3x^2 - 4x - 12 = x^2 (x+3) - 4(x+3).

    And you know how to factorise by taking out a common factor ...?
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  3. #3
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    Sure I know. I had tried factoring all terms by x+3 and resulted too complicated. Didn't know you could consider them sepatately. Thanks.
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    Quote Originally Posted by Alienis Back View Post
    I don't know how to factor these four terms. I know factoring is all about finding factors but I need help to find out where that 3+x comes from and how can I do it.
    x^3 + 3x^2 - 4x - 12 = x^2 (x+3) - 4(x+3)

    take common (x + 3)

    =(x+3)(x^2-4)

    Now, can you proceed further???
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  5. #5
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    Thanks guys. I did it!
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