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Question about Polynomials?

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(x^2 - 4)(x^2 + 4) = x^4, right?

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  1. x^4-16


  2. foil it.

    x^4+4x^2-4x^2-16

    x^4-16

  3. no  = x^4 -16

    its a form of differnce of 2 squares but just with high powers

    foil it out and u get my answer

    u just forgot the last term silly!

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

    x^4 + 4x^2 - 4x^2 - 16 =

    x^4 -16
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