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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)
(x^2+4*x-12)/(x^2-(5*x)+6) = 0
(x^2+4*x-12)/(x^2-5*x+6) = 0
x^2+4*x-12 = 0
x^2+4*x-12 = 0
DELTA = 4^2-(-12*1*4)
DELTA = 64
DELTA > 0
x = (64^(1/2)-4)/(1*2) or x = (-64^(1/2)-4)/(1*2)
x = 2 or x = -6
(x+6)*(x-2) = 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
((x+6)*(x-2))/((x-2)*(x-3)) = 0
( x+6 )
x+6 = 0 // - 6
x = -6
( x-2 )
x-2 = 0 // + 2
x = 2
x in { 2}
x = -6
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