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Math Help - factorizing

  1. #1
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    factorizing

    factorizing this:

     <br />
x^4-64x<br />

     <br />
= (x^2+8)(x+4)(x-4)<br />

    correct?
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  2. #2
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    I don't think so. Pull out an x immediately. x(x^3-64). Now write 64 as a cube. x(x^3-4^3). Now you can plug this into a difference of cubes formula.

    When you expand the answer you have back out, it doesn't give the original expression.
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  3. #3
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    Quote Originally Posted by Jameson View Post
    I don't think so. Pull out an x immediately. x(x^3-64). Now write 64 as a cube. x(x^3-4^3). Now you can plug this into a difference of cubes formula.

    When you expand the answer you have back out, it doesn't give the original expression.
    ahhh yeah so

    x(x^3-4^3)
    x(x-4)(x^2+4x+16)

    ?
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  4. #4
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    You got it
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