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D( x )
10*x^2-(2*x) = 0
10*x^2-(2*x) = 0
10*x^2-(2*x) = 0
10*x^2-2*x = 0
10*x^2-2*x = 0
DELTA = (-2)^2-(0*4*10)
DELTA = 4
DELTA > 0
x = (4^(1/2)+2)/(2*10) or x = (2-4^(1/2))/(2*10)
x = 1/5 or x = 0
x in (-oo:0) U (0:1/5) U (1/5:+oo)
(18*x)/(10*x^2-(2*x)) = 0
(18*x)/(10*x^2-2*x) = 0
10*x^2-2*x = 0
2*x*(5*x-1) = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
2*x*(x-1/5) = 0
(18*x)/(2*x*(x-1/5)) = 0
18*x = 0 // : 18
x = 0
x in { 0}
x belongs to the empty set
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