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

7*x-4*x-28*x^-2 = 0

3*x-28*x^-2 = 0

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

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

x^-3 = 3/28

-3 < 0

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

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

28/3 = x^3

x^3 = 28/3 // ^ 1/3

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

x = 0

x = 0

x in { 0} 

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

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