25/(x^3)=20

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Solution for 25/(x^3)=20 equation: 


D( x )

x^3 = 0

x^3 = 0

x^3 = 0

1*x^3 = 0 // : 1

x^3 = 0

x = 0

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

25/(x^3) = 20 // - 20

25/(x^3)-20 = 0

25*x^-3 = 20 // : 25

x^-3 = 4/5

-3 < 0

1/(x^3) = 4/5 // * x^3

1 = 4/5*x^3 // : 4/5

5/4 = x^3

x^3 = 5/4 // ^ 1/3

x = (5/4)^(1/3)

x = (5/4)^(1/3)

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