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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(2500/(x^2)) = 0
1-2500*x^-2 = 0
-2500*x^-2 = -1 // : -2500
x^-2 = 1/2500
-2 < 0
1/(x^2) = 1/2500 // * x^2
1 = 1/2500*x^2 // : 1/2500
2500 = x^2
x^2 = 2500 // ^ 1/2
abs(x) = 50
x = 50 or x = -50
x in { 50, -50 }
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