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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x^2-(15*x)+11)/x+2 = 0
(4*x^2-15*x+11)/x+2 = 0
(4*x^2-15*x+11)/x+(2*x)/x = 0
4*x^2-15*x+2*x+11 = 0
4*x^2-13*x+11 = 0
4*x^2-13*x+11 = 0
4*x^2-13*x+11 = 0
DELTA = (-13)^2-(4*4*11)
DELTA = -7
DELTA < 0
1 = 0
1/x = 0
1/x = 0 // * x
1 = 0
x belongs to the empty set
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