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Math Help - Checking for accuracy

  1. #1
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    Checking for accuracy

    (2 sqrt6 - 4 sqrt3)(4 sqrt6 + 8 sqrt3)
    I used the FOIL method
    2sqrt6 * 4sqrt6 + 2sqrt6 * 8sqrt3 - 4sqrt3 * 4sqrt6 - 4sqrt3 * 8sqrt3
    12sqrt36 - 32sqrt9
    I got alittle stuck here but I then I realized what the next step was
    12 * 6 - 32 * 3
    72 - 96
    -24


    If this is correct I think I am on the right track...Thanks
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  2. #2
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    Opalg's Avatar
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    Quote Originally Posted by Brama Bull View Post
    (2 sqrt6 - 4 sqrt3)(4 sqrt6 + 8 sqrt3)
    I used the FOIL method
    2sqrt6 * 4sqrt6 + 2sqrt6 * 8sqrt3 - 4sqrt3 * 4sqrt6 - 4sqrt3 * 8sqrt3
    12sqrt36 - 32sqrt9
    I got a little stuck here but I then I realized what the next step was
    12 * 6 - 32 * 3
    72 - 96
    -24


    If this is correct I think I am on the right track...Thanks
    The only mistake is that red 12, which should be 8 (so the answer is –48, not –24).
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