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Math Help - Need Help Creating A Graph

  1. #1
    Member
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    Need Help Creating A Graph

    Hi, I thought this should go into college level, really sorry if you guys think its at more of a high school level. Anyways...

    Ive got his really long drawn out problem, and 2 people i usually get to help me have given me conflicting solutions.....

    anyway, ive simplified the example to pure maths and done away with all the, "this train arrives at".......etc etc........ here goes

    If C = 500 + 10X - X^2
    R = 150X - 4X^2
    P = C - R
    show that P = -3X^2 + 140X - 500

    then Im supposed to represent the graph of P against X
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  2. #2
    Grand Panjandrum
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    Quote Originally Posted by bobchiba View Post
    Hi, I thought this should go into college level, really sorry if you guys think its at more of a high school level. Anyways...

    Ive got his really long drawn out problem, and 2 people i usually get to help me have given me conflicting solutions.....

    anyway, ive simplified the example to pure maths and done away with all the, "this train arrives at".......etc etc........ here goes

    If C = 500 + 10X - X^2
    R = 150X - 4X^2
    P = C - R
    show that P = -3X^2 + 140X - 500

    then Im supposed to represent the graph of P against X
    Well it does not

    P = (500+10x-x^2) - (150x-4x^2) = (-x^2+4x^2) + (10x-150x) +500 = 3x^2-140x+500

    RonL
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