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Math Help - algebra

  1. #1
    kel
    kel is offline
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    algebra

    Expand (a+5)(a+7)
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  2. #2
    Super Member 11rdc11's Avatar
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    Use foil
    Last edited by 11rdc11; September 9th 2008 at 02:17 AM.
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  3. #3
    Newbie Firstone's Avatar
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    Hello

    You can use the smile face rule.
    (a+5)(a+7)
    (a*a) + (5*7) + (a*7) + (a*5)
    a^2 + 35 + 7a + 5a
    a^2 + 12a + 35
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