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D( x )
x^2-(6*x)+8 = 0
x^2-(6*x)+8 = 0
x^2-(6*x)+8 = 0
x^2-6*x+8 = 0
x^2-6*x+8 = 0
DELTA = (-6)^2-(1*4*8)
DELTA = 4
DELTA > 0
x = (4^(1/2)+6)/(1*2) or x = (6-4^(1/2))/(1*2)
x = 4 or x = 2
x in (-oo:2) U (2:4) U (4:+oo)
(x^2-(3*x)-10)/(x^2-(6*x)+8) = 0
(x^2-3*x-10)/(x^2-6*x+8) = 0
x^2-3*x-10 = 0
x^2-3*x-10 = 0
DELTA = (-3)^2-(-10*1*4)
DELTA = 49
DELTA > 0
x = (49^(1/2)+3)/(1*2) or x = (3-49^(1/2))/(1*2)
x = 5 or x = -2
(x+2)*(x-5) = 0
x^2-6*x+8 = 0
x^2-6*x+8 = 0
DELTA = (-6)^2-(1*4*8)
DELTA = 4
DELTA > 0
x = (4^(1/2)+6)/(1*2) or x = (6-4^(1/2))/(1*2)
x = 4 or x = 2
(x-2)*(x-4) = 0
((x+2)*(x-5))/((x-2)*(x-4)) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x-5 )
x-5 = 0 // + 5
x = 5
x in { -2, 5 }
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