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D( x )
x^2-(5*x)+6 = 0
x^2-(5*x)+6 = 0
x^2-(5*x)+6 = 0
x^2-5*x+6 = 0
x^2-5*x+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)+5)/(1*2) or x = (5-1^(1/2))/(1*2)
x = 3 or x = 2
x in (-oo:2) U (2:3) U (3:+oo)
(3*x-7)/(x^2-(5*x)+6) = 0
(3*x-7)/(x^2-5*x+6) = 0
x^2-5*x+6 = 0
x^2-5*x+6 = 0
DELTA = (-5)^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)+5)/(1*2) or x = (5-1^(1/2))/(1*2)
x = 3 or x = 2
(x-2)*(x-3) = 0
(3*x-7)/((x-2)*(x-3)) = 0
3*x-7 = 0 // + 7
3*x = 7 // : 3
x = 7/3
x = 7/3
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