0.25-(400/x^2)=0

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Solution for 0.25-(400/x^2)=0 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)

0.25-(400/(x^2)) = 0

0.25-400*x^-2 = 0

-400*x^-2 = -0.25 // : -400

x^-2 = 0.000625

-2 < 0

1/(x^2) = 0.000625 // * x^2

1 = 0.000625*x^2 // : 0.000625

1600 = x^2

x^2 = 1600 // ^ 1/2

abs(x) = 40

x = 40 or x = -40

x in { 40, -40 }

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