7x+28/x^2+4x

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Solution for 7x+28/x^2+4x equation: 


D( x )

x^2 = 0

x^2 = 0

x^2 = 0

1*x^2 = 0 // : 1

x^2 = 0

x = 0

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

7*x+4*x+28/(x^2) = 0

11*x+28*x^-2 = 0

x*(28*x^-3+11) = 0

28*x^-3 = -11 // : 28

x^-3 = -11/28

-3 < 0

1/(x^3) = -11/28 // * x^3

1 = -11/28*x^3 // : -11/28

-28/11 = x^3

x^3 = -28/11 // ^ 1/3

x = -(28/11)^(1/3)

x = 0

x = 0

x in { 0} 

x = -(28/11)^(1/3)

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