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Math Help - inequality

  1. #1
    Banned
    Joined
    Jul 2009
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    107

    inequality

    For what values of x and y is the following inequality is satisfied:


    x^2y^2+x+y>7

    Give a proof
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  2. #2
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    Joined
    May 2010
    Posts
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    Do like if y is fixed for example and then solve the second degree equation on x. You calculate delta , see when delta>0 or delta<0 depending on y. At the end you will find your surface. At the end to check you are right, you have to obtain a surface that is symmetric by the straight line y=x, because the equation is invariant by changing x to y.
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