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

    May 11, 2011, 09:27 AM
    find the focus of a parabola
    the reflections are modeled by the equation y = 1/4p( x - h )2 + K

    if the width of the dish if 4m and the depth is 0.4m where is the focus?
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    May 11, 2011, 06:46 PM
    Just do the algebra to get the equation in the form , and then use the definition of the focus. It's coordinates are:



    Can you do that?
    longjohnsilver's Avatar
    longjohnsilver Posts: 2, Reputation: 1
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    #3

    May 12, 2011, 07:08 AM
    Thanks for your help I figured it out
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