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D( x )
x-2.2 = 0
x-2.2 = 0
x-2.2 = 0
x-2.2 = 0 // + 2.2
x = 2.2
x in (-oo:2.2) U (2.2:+oo)
(4*x^2-(5*x)+10)/(x-2.2) = 0
(4*x^2-5*x+10)/(x-2.2) = 0
4*x^2-5*x+10 = 0
4*x^2-5*x+10 = 0
DELTA = (-5)^2-(4*4*10)
DELTA = -135
DELTA < 0
1 = 0
1/(x-2.2) = 0
x belongs to the empty set
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