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D( x )
x = 0
x^2 = 0
x = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
100/(x^2)-25-1 = (2*x)/x-2 // - (2*x)/x-2
100/(x^2)-((2*x)/x)-25-1+2 = 0
100/(x^2)-25-2-1+2 = 0
100*x^-2 = 26 // : 100
x^-2 = 13/50
-2 < 0
1/(x^2) = 13/50 // * x^2
1 = 13/50*x^2 // : 13/50
50/13 = x^2
x^2 = 50/13 // ^ 1/2
abs(x) = (50/13)^(1/2)
x = (50/13)^(1/2) or x = -(50/13)^(1/2)
x in { (50/13)^(1/2), -(50/13)^(1/2) }
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