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Math Help - check answer,algebra plz

  1. #1
    Newbie
    Joined
    Oct 2008
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    2

    check answer,algebra plz

    Expand collect like terms:

    x(x+7)+4(x^2-5)

    =x^2+7x+4x^2-20

    = 5x^4+7x-20

    i'm not sure if i'm was suppose to add the exponents together to make 5x^4

    or 5x^2
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  2. #2
    Senior Member
    Joined
    Dec 2007
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    Melbourne
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    428
    It should have been 5x^2, but apart from that you are completely right.
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  3. #3
    Newbie
    Joined
    Sep 2008
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    Do not add the exponents!

    x^2 + 4x^2 = 5x^2
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  4. #4
    Newbie
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    Oct 2008
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    thanks guy, really appreciate the help
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