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Math Help - help creating a graph

  1. #1
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    help creating a graph

    Hey guys, could someone please give me some advice as how to go about creating a graph for P = 85X - X^2 - 550,

    Thank you.
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  2. #2
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    Oct 2008
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    Let's re-arrange the equation a little to look like this:
    P = - X^2 + 85X - 550

    From the  - X^2 term, we can tell 2 things. The squared tells you that it is a parabola. The negative sign tells you that it opens downward.

    Next, the easiest thing to do is find the y-intercept. Let X = 0 and you'll get the point that the graph intersects the y-axis.

    Since this is in the high school help forum, I would assume you know the quadratic formula, so use that to solve for the x-intercepts.

    Then you can simply connect the 3 points with a smooth curve (where your y-intercept is your maximum point) and you'll have your curve.
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  3. #3
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    ok Ive spent a couple hours learning the formulas, I posted my new question in the urgent section, i started over again, but having trouble with y intercept, thank you for your help.
    Last edited by bobchiba; November 6th 2008 at 07:36 PM.
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