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Math Help - Quadratic Transformations urgent

  1. #1
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    Exclamation Quadratic Transformations urgent


    I need a little help with this problem...

    Number of coputers produced-Profit
    50---------------------------$5100
    100--------------------------$5600
    150--------------------------$1100

    A-Find a quadratic function that describes the profit as a function of the number of computers produced.

    B-Predict the number of computers that need to be produced to maximize the profit.

    C-Predict the max profit, assuming that all business conditions stay the same.

    For a i have -1.2x^2+189.7+-1390.... i dont know if its right

    And for b i found 79 computers....

    and for c i found $6107.1

    i dont think this makes since... this would mean that between 50-100 it would have hit its max and dropped
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  2. #2
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    I get ...

    P = -x^2 + 160x - 400

    max profit at x = 80 computers

    P(80) = 6000
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  3. #3
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    Thanks! that makes more sense, i must have had rounded somethin wrong. or wasnt supposed to. But may i ask how did you get the equation?
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  4. #4
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    quadratic regression on a TI-84 calculator.
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  5. #5
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    oh ok i think i got it now....so i enter data in to list. and quadreg it? and im on ti-83 would that matter?
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  6. #6
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    TI-83 does it the same way.
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  7. #7
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    k thanks agn i appreciate it
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