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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
((-2*x)^2-(3*x)-1)/(x-1) = 0
((-2*x)^2-3*x-1)/(x-1) = 0
(4*x^2-3*x-1)/(x-1) = 0
4*x^2-3*x-1 = 0
4*x^2-3*x-1 = 0
DELTA = (-3)^2-(-1*4*4)
DELTA = 25
DELTA > 0
x = (25^(1/2)+3)/(2*4) or x = (3-25^(1/2))/(2*4)
x = 1 or x = -1/4
(x+1/4)*(x-1) = 0
x+1/4 = 0
x+1/4 = 0 // - 1/4
x = -1/4
x = -1/4
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