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D( x )
x^2-(4*x)+3 = 0
x^2-(4*x)+3 = 0
x^2-(4*x)+3 = 0
x^2-4*x+3 = 0
x^2-4*x+3 = 0
DELTA = (-4)^2-(1*3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+4)/(1*2) or x = (4-4^(1/2))/(1*2)
x = 3 or x = 1
x in (-oo:1) U (1:3) U (3:+oo)
(x^2-x-2)/(x^2-(4*x)+3) = 0
(x^2-x-2)/(x^2-4*x+3) = 0
x^2-x-2 = 0
x^2-x-2 = 0
DELTA = (-1)^2-(-2*1*4)
DELTA = 9
DELTA > 0
x = (9^(1/2)+1)/(1*2) or x = (1-9^(1/2))/(1*2)
x = 2 or x = -1
(x+1)*(x-2) = 0
x^2-4*x+3 = 0
x^2-4*x+3 = 0
DELTA = (-4)^2-(1*3*4)
DELTA = 4
DELTA > 0
x = (4^(1/2)+4)/(1*2) or x = (4-4^(1/2))/(1*2)
x = 3 or x = 1
(x-1)*(x-3) = 0
((x+1)*(x-2))/((x-1)*(x-3)) = 0
( x+1 )
x+1 = 0 // - 1
x = -1
( x-2 )
x-2 = 0 // + 2
x = 2
x in { -1, 2 }
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