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D( x )
x^2+5*x+6 = 0
x^2-1 = 0
x+2 = 0
x^2+5*x+6 = 0
x^2+5*x+6 = 0
x^2+5*x+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)-5)/(1*2) or x = (-1^(1/2)-5)/(1*2)
x = -2 or x = -3
x^2-1 = 0
x^2-1 = 0
1*x^2 = 1 // : 1
x^2 = 1
x^2 = 1 // ^ 1/2
abs(x) = 1
x = 1 or x = -1
x+2 = 0
x+2 = 0
x+2 = 0 // - 2
x = -2
x in (-oo:-3) U (-3:-2) U (-2:-1) U (-1:1) U (1:+oo)
(((3*x-3)/(x+2))/(x^2-1))/(x^2+5*x+6) = 0
(3*x-3)/((x+2)*(x^2-1)*(x^2+5*x+6)) = 0
x^2+5*x+6 = 0
x^2+5*x+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
x = (1^(1/2)-5)/(1*2) or x = (-1^(1/2)-5)/(1*2)
x = -2 or x = -3
(x+3)*(x+2) = 0
(3*x-3)/((x+2)^2*(x^2-1)*(x+3)) = 0
3*x-3 = 0 // + 3
3*x = 3 // : 3
x = 3/3
x = 1
x in { 1}
x belongs to the empty set
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