X^2-81/x

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Solution for X^2-81/x equation: 


D( x )

x = 0

x = 0

x = 0

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

X^2-(81/x) = 0

X^2-81*x^-1 = 0

-81*x^-1 = -X^2 // : -81

x^-1 = (X^2)/81

-1 < 0

1/(x^1) = (X^2)/81 // * x^1

1 = ((X^2)/81)*x^1 // : (X^2)/81

81*X^-2 = x^1

x = 81*X^-2

x = 81*X^-2

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