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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/(x^2)-25 = 0
1*x^-2 = 25 // : 1
x^-2 = 25
-2 < 0
1/(x^2) = 25 // * x^2
1 = 25*x^2 // : 25
1/25 = x^2
x^2 = 1/25 // ^ 1/2
abs(x) = 1/5
x = 1/5 or x = -1/5
x in { 1/5, -1/5 }
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