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Math Help - Accuplacer practice exam help

  1. #1
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    Accuplacer practice exam help

    Hello board. I'm trying to solve the problems on the accuplacer practice exam online and am having trouble with one of the questions. It is:

    What is the value of the expression 2x + 3xy 4y when x = 2 and y = - 4?

    The answer I keep coming up with is -4. The only choices are -80, 80, -32, and 32.

    What am I doing wrong?
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  2. #2
    MHF Contributor Siron's Avatar
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    Re: Accuplacer practice exam help

    Fill in:
    2.2^2+3.2.(-4)-4.(-4)^2=8-24-64=-80
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  3. #3
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    Re: Accuplacer practice exam help

    Quote Originally Posted by Siron View Post
    Fill in:
    2.2^2+3.2.(-4)-4.(-4)^2=8-24-64=-80
    @Siron, here is a LaTeX suggestion:
    [tex]2\cdot 2^2+3\cdot 2\cdot (-4)-4\cdot (-4)^2=8-24-64=-80[/tex] gives 2\cdot 2^2+3\cdot 2\cdot (-4)-4\cdot (-4)^2=8-24-64=-80 .
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  4. #4
    MHF Contributor Siron's Avatar
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    Re: Accuplacer practice exam help

    Thanks for the notice.
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  5. #5
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    Re: Accuplacer practice exam help

    Thanks guys....I guess I was retaining the original values and not changing them.
    I appreciate it!
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