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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
25*x = 1/x // - 1/x
25*x-(1/x) = 0
25*x-x^-1 = 0
25*x^1-1*x^-1 = 0
(25*x^2-1*x^0)/(x^1) = 0 // * x^2
x^1*(25*x^2-1*x^0) = 0
x^1
25*x^2-1 = 0
25*x^2-1 = 0
DELTA = 0^2-(-1*4*25)
DELTA = 100
DELTA > 0
x = (100^(1/2)+0)/(2*25) or x = (0-100^(1/2))/(2*25)
x = 1/5 or x = -1/5
x in { -1/5, 1/5}
x in { -1/5, 1/5 }
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