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D( x )
5*x^2 = 0
5*x^2 = 0
5*x^2 = 0
5*x^2 = 0 // : 5
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
10*x+(5*x)/(5*x^2) = 0
10*x^1+1*x^-1 = 0
(10*x^2+1*x^0)/(x^1) = 0 // * x^2
x^1*(10*x^2+1*x^0) = 0
x^1
10*x^2+1 = 0
10*x^2+1 = 0
DELTA = 0^2-(1*4*10)
DELTA = -40
DELTA < 0
x in { }
x belongs to the empty set
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