18x^3+4x^2/x

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Solution for 18x^3+4x^2/x equation: 


D( x )

x = 0

x = 0

x = 0

x in (-oo:0) U (0:+oo)

18*x^3+(4*x^2)/x = 0

18*x^3+4*x = 0

2*x*(9*x^2+2) = 0

9*x^2 = -2 // : 9

x^2 = -2/9

2*x = 0

2*x = 0 // : 2

x = 0

x in { 0} 

x belongs to the empty set

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