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Math Help - Incredibly Easy Math Problem

  1. #1
    Member Mr Rayon's Avatar
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    Exclamation Incredibly Easy Math Problem

    I know the answer to this is -23, but I do not know the correct working-out to it.So please show working-out. All help is appreciated.

    If a=3, b=-2 and c=-5, then the value of 6a+3a-5bsquared-abc=
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  2. #2
    Bar0n janvdl's Avatar
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    Quote Originally Posted by Mr Rayon View Post
    I know the answer to this is -23, but I do not know the correct working-out to it.So please show working-out. All help is appreciated.

    If a=3, b=-2 and c=-5, then the value of 6a+3a-5bsquared-abc=
    a = 3
    b = -2
    c = -5

    6a + 3a - 5b^2 - abc

    = 9a - 5b^2 - abc

    = 9(3) - 5(-2)^2 - (3)(-2)(-5)

    = 9(3) - 5(4) - (3)(-2)(-5)

    = 27 - 20 - 30

    = 7 - 30

    = -23
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