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Math Help - help

  1. #1
    Newbie
    Joined
    May 2007
    Posts
    10

    help

    3x^2 - 5x for x = -3
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  2. #2
    Junior Member
    Joined
    Dec 2006
    Posts
    74
    It is the same as the other question you asked.
    All you have to do for this kind of questions, is to erase x and write the number insted.
    Tip:Use brakets if the number is negativ
    3x^2-5x, x=-3
    3(-3)^2-5(-3)=3(9)+15=27+15=42
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