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Math Help - factoring

  1. #1
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    factoring

    ...having some trubles with factoring.

    I was wondering if someone could show me how to factor these.

    x^2-16




    641^2-49y^2




    Any help would be appreciated.
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  2. #2
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    Quote Originally Posted by smallman_11 View Post
    ...having some trubles with factoring.

    I was wondering if someone could show me how to factor these.

    x^2-16




    641^2-49y^2




    Any help would be appreciated.
    x^2 - 16

    Factoring the above: (x - 4)*(x + 4)...do FOIL (First, Outer, Inner, Last) and check that it works.

    641^2-49y^2

    Factoring the above: (-7*y + 641)*(7*y + 641); again, check.
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  3. #3
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    thanks for the help.
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  4. #4
    MHF Contributor Quick's Avatar
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    Quote Originally Posted by smallman_11 View Post
    ...having some trubles with factoring.

    I was wondering if someone could show me how to factor these.

    x^2-16




    641^2-49y^2




    Any help would be appreciated.
    When given an expression: a^2-b^2 then it factors to: (a+b)(a-b)
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