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