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Math Help - Distribution Issue?

  1. #1
    Junior Member
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    Distribution Issue?

    Again with the O of O (I thought I had it licked)

    2^3 -10[4 -(-2 +18)3]

    8 -10[4 +2 -18 +3]

    8 -10[6 -15]

    8 -10(-9)

    8 + 90

    98

    But that's incorrect. The book says the answer is 448, so I'm a long way off. The only think I can think of is that it's a distribution problem. Any help is greatly appreciated.
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  2. #2
    A Plied Mathematician
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    In going to the second step, you had -(-2+18)3 turn into 2-18+3. The 3 was multiplying (parentheses mean multiplication, unless used as part of a function label) the (-2+18), but then it was added. So you need to multiply the result of what was in the parentheses by 3.
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  3. #3
    Pim
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    Your mistake is in the first step.

    4-(-2+18)3 = 4-(-16)*3, multiplication before subtraction, so
    that makes 4+48, which should lead you to the correct answer.
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