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