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Math Help - Please solve

  1. #1
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    Lightbulb Please solve

    Please fully solve it and give description with!THANKS
    (2p+q-r)^3
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  2. #2
    Lord of certain Rings
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    Quote Originally Posted by Peacewanters007 View Post
    Please fully solve it and give description with!THANKS
    (2p+q-r)^3
    To solve it we need an equation and that means (2p+q-r)^3 = something....

    So,
    (2p+q-r)^3 = ??
    Please give "full description"
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  3. #3
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Peacewanters007 View Post
    Please fully solve it and give description with!THANKS
    (2p+q-r)^3
    You need to expand this?

    (2p + q - r)^3 = ((2p + q) - r)^3

    By the binomial theorem:
    = (2p + q)^3 + 3(2p + q)^2(-r) + 3(2p + q)(-r)^2 + (-r)^3

    You take it from here.

    -Dan
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