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D( x )
x+3 = 0
x+3 = 0
x+3 = 0
x+3 = 0 // - 3
x = -3
x in (-oo:-3) U (-3:+oo)
(x^3+3*x^2-(2*x)-6)/(x+3) = 0
(x^3+3*x^2-2*x-6)/(x+3) = 0
x^3+3*x^2-2*x-6 = 0
x^3+3*x^2-2*x-6
x^2*(x+3)-2*x-6
x^2*(x+3)-2*(x+3)
(x^2-2)*(x+3)
x^2-2 = 0
1*x^2 = 2 // : 1
x^2 = 2
x^2 = 2 // ^ 1/2
abs(x) = 2^(1/2)
x = 2^(1/2) or x = -2^(1/2)
x in { 2^(1/2), -2^(1/2) }
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