(x+2)/(x^3+8)

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Solution for (x+2)/(x^3+8) equation: 


D( x )

x^3+8 = 0

x^3+8 = 0

x^3+8 = 0

1*x^3 = -8 // : 1

x^3 = -8

x^3 = -8 // ^ 1/3

x = -2

x in (-oo:-2) U (-2:+oo)

(x+2)/(x^3+8) = 0

x+2 = 0 // - 2

x = -2

x in { -2} 

x belongs to the empty set

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