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Math Help - Problem evaluating an expression

  1. #1
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    Unhappy Problem evaluating an expression

    I am trying to find the answer to this problem but I'm doing something wrong, and I can't figure out what mistake I'm making.

    Here's the problem:

    (-2)-2(-2)3+3


    First I got rid of exponents:

    4-2(-2)3+9

    Then I multiplied:

    4-12+9

    Last, I added and subtracted:

    4-12+9=1

    But here's the problem, 1 is not the answer, 25 is the answer, but I have no idea how someone would get 25. What am I doing wrong?
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  2. #2
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    Quote Originally Posted by bryang View Post
    I am trying to find the answer to this problem but I'm doing something wrong, and I can't figure out what mistake I'm making.

    Here's the problem:

    (-2)-2(-2)3+3

    First I got rid of exponents:

    4-2(-2)3+9

    Then I multiplied:

    4-12+9 Mr F says: minus times minus gives plus ..... This line should be 4 + 12 + 9.

    [snip]
    ..
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  3. #3
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    Oh, yes, that's the problem. Thanks for your quick help.
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