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Math Help - Factor Completely

  1. #1
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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. #2
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    Yes, each factorisation is a difference of two squares...
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