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Math Help - Quick Question

  1. #1
    Super Member
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    Quick Question

    Hi
    Can someone tell me how i would work this out:

    Express the following in the form x+y\sqrt2 with x and y rational numbers:
    (7+5\sqrt2)^3

    P.S
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  2. #2
    MHF Contributor red_dog's Avatar
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    Use the formula (a+b)^3=a^3+3a^2b+3ab^2+b^3
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