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D( x )
x^2-(2*x)-3 = 0
x^2-(2*x)-3 = 0
x^2-(2*x)-3 = 0
x^2-2*x-3 = 0
x^2-2*x-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(1*2) or x = (2-16^(1/2))/(1*2)
x = 3 or x = -1
x in (-oo:-1) U (-1:3) U (3:+oo)
1/(x^2-(2*x)-3) = 0
1/(x^2-2*x-3) = 0
x^2-2*x-3 = 0
x^2-2*x-3 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
x = (16^(1/2)+2)/(1*2) or x = (2-16^(1/2))/(1*2)
x = 3 or x = -1
(x+1)*(x-3) = 0
1/((x+1)*(x-3)) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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