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D( x )
x-2 = 0
x-2 = 0
x-2 = 0
x-2 = 0 // + 2
x = 2
x in (-oo:2) U (2:+oo)
(x^2-(3*x)+8)/(x-2) = 0
(x^2-3*x+8)/(x-2) = 0
x^2-3*x+8 = 0
x^2-3*x+8 = 0
DELTA = (-3)^2-(1*4*8)
DELTA = -23
DELTA < 0
1 = 0
1/(x-2) = 0
x belongs to the empty set
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