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D( x )
x^2+3*x+2 = 0
x^2+3*x+2 = 0
x^2+3*x+2 = 0
x^2+3*x+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-3)/(1*2) or x = (-1^(1/2)-3)/(1*2)
x = -1 or x = -2
x in (-oo:-2) U (-2:-1) U (-1:+oo)
(x^2+8*x+12)/(x^2+3*x+2) = 0
x^2+8*x+12 = 0
x^2+8*x+12 = 0
DELTA = 8^2-(1*4*12)
DELTA = 16
DELTA > 0
x = (16^(1/2)-8)/(1*2) or x = (-16^(1/2)-8)/(1*2)
x = -2 or x = -6
(x+6)*(x+2) = 0
x^2+3*x+2 = 0
x^2+3*x+2 = 0
DELTA = 3^2-(1*2*4)
DELTA = 1
DELTA > 0
x = (1^(1/2)-3)/(1*2) or x = (-1^(1/2)-3)/(1*2)
x = -1 or x = -2
(x+2)*(x+1) = 0
((x+6)*(x+2))/((x+2)*(x+1)) = 0
( x+2 )
x+2 = 0 // - 2
x = -2
( x+6 )
x+6 = 0 // - 6
x = -6
x in { -2}
x = -6
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