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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(250/x) = 0
X^2-250*x^-1 = 0
-250*x^-1 = -X^2 // : -250
x^-1 = (X^2)/250
-1 < 0
1/(x^1) = (X^2)/250 // * x^1
1 = ((X^2)/250)*x^1 // : (X^2)/250
250*X^-2 = x^1
x = 250*X^-2
x = 250*X^-2
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