20-(1/x^2)

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Solution for 20-(1/x^2) 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)

20-(1/(x^2)) = 0

20-x^-2 = 0

-1*x^-2 = -20 // : -1

x^-2 = 20

-2 < 0

1/(x^2) = 20 // * x^2

1 = 20*x^2 // : 20

1/20 = x^2

x^2 = 1/20 // ^ 1/2

abs(x) = (1/20)^(1/2)

x = (1/20)^(1/2) or x = -(1/20)^(1/2)

x in { (1/20)^(1/2), -(1/20)^(1/2) }

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