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Math Help - Checking my work

  1. #1
    Newbie
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    Aug 2009
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    Checking my work

    Multiply
    (8x+4)(8x^2+2x+8)
    My work;
    8x^2 +2x +8
    8x+4
    32x^2+8x + 32
    64x^2+16x^2+64x
    64x^2+48x^2+72x+32
    112x^2+72x+32
    Have I done a good job?
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  2. #2
    MHF Contributor
    Joined
    Sep 2008
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    West Malaysia
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    1,261
    Quote Originally Posted by NotThatGood View Post
    Multiply
    (8x+4)(8x^2+2x+8)
    My work;
    8x^2 +2x +8
    8x+4
    32x^2+8x + 32
    64x^2+16x^2+64x
    64x^2+48x^2+72x+32
    112x^2+72x+32
    Have I done a good job?
    (8x+4)(8x^2+2x+8)

    =64x^3+16x^2+64x+32x^2+8x+32

    =64x^3=48x^2+72x+32
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  3. #3
    MHF Contributor

    Joined
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    Quote Originally Posted by mathaddict View Post
    (8x+4)(8x^2+2x+8)

    =64x^3+16x^2+64x+32x^2+8x+32

    =64x^3=48x^2+72x+32
    typo:
    =64x^3+ 48x^2+72x+32
    of course.
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  4. #4
    MHF Contributor

    Joined
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    Quote Originally Posted by NotThatGood View Post
    Multiply
    (8x+4)(8x^2+2x+8)
    My work;
    8x^2 +2x +8
    8x+4
    32x^2+8x + 32
    64x^2+16x^2+64x
    64x^2+48x^2+72x+32
    8x^2 times 8x is 64x^3, not 64x^2.

    112x^2+72x+32
    Have I done a good job?
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