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D( x )
x < 0
x < 0
x in <0:+oo)
x^(1/2)+y^(1/2) = 10 // - 10
x^(1/2)+y^(1/2)-10 = 0
1*x^(1/2) = -(y^(1/2)-10) // : 1
x^(1/2) = 10-y^(1/2)
x^(1/2) = 10-y^(1/2) // ^ 2
x = (10-y^(1/2))^2
x = (10-y^(1/2))^2
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