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    horseridrgrl's Avatar
    horseridrgrl Posts: 2, Reputation: 1
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    #1

    Feb 4, 2007, 02:33 PM
    Precal test
    How do I answer this question...

    *** Write in standard form the equation of the parabola with the vertex (-2,3) that passes through (0,7).
    sweetface125071's Avatar
    sweetface125071 Posts: 6, Reputation: 1
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    #2

    Mar 10, 2007, 04:35 PM
    Quote Originally Posted by horseridrgrl
    How do I answer this question....

    *** Write in standard form the equation of the parabola with the vertex (-2,3) that passes through (0,7).
    The vertex of the parabola would be (h,k)
    the general eq of a parabola is (x-h)=4p(y-k) or (y-k)= 4p(x-h)
    subsitute for h and k
    the eq you use depends on when you graph the points if they are parallel to the y or x axis
    Use the 2 points given and choose another point which would make the parabola symmetrical . With the three points you can write three eq and solve for p
    asterisk_man's Avatar
    asterisk_man Posts: 476, Reputation: 32
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    #3

    Mar 10, 2007, 08:30 PM
    two points aren't enough to specify a parabola. In this case it could open either up or right. Also I'm not 100% sure of the previous poster's parabola equations. It's been a while but I thought there was an exponent in there somewhere.
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