-0.040=-1/n^2

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Solution for -0.040=-1/n^2 equation: 


D( n )

n^2 = 0

n^2 = 0

n^2 = 0

1*n^2 = 0 // : 1

n^2 = 0

n = 0

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

-0.04 = -1/(n^2) // + -1/(n^2)

-(-1/(n^2))-0.04 = 0

n^-2-0.04 = 0

1*n^-2 = 0.04 // : 1

n^-2 = 0.04

-2 < 0

1/(n^2) = 0.04 // * n^2

1 = 0.04*n^2 // : 0.04

25 = n^2

n^2 = 25 // ^ 1/2

abs(n) = 5

n = 5 or n = -5

n in { 5, -5 }

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