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Thread: Factor Completely

  1. February 2nd 2011, 08:19 PM #1
    alyosha2
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    Factor Completely

    <br /> x^4 - y^4 = (x^2 + y^2)(x^2 - y^2)<br /> \\ = (x^2 + y^2)(x + y)(x - y)<br />

    I'm ok with this until the last part. It looks like as the second term is a difference of squares it has been factored as well. I'm just a bit fuzzy on the use of brackets here. Can anyone help?

    Thanks.
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  2. February 2nd 2011, 08:20 PM #2
    Prove It
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    Yes, each factorisation is a difference of two squares...
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