19=50(8/x)^2

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Solution for 19=50(8/x)^2 equation: 


D( x )

x = 0

x = 0

x = 0

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

19 = 50*(8/x)^2 // - 50*(8/x)^2

19-(50*(8/x)^2) = 0

19-50*(8/x)^2 = 0

-3200*x^-2 = -19 // : -3200

x^-2 = 19/3200

-2 < 0

1/(x^2) = 19/3200 // * x^2

1 = 19/3200*x^2 // : 19/3200

3200/19 = x^2

x^2 = 3200/19 // ^ 1/2

abs(x) = (3200/19)^(1/2)

x = (3200/19)^(1/2) or x = -(3200/19)^(1/2)

x in { (3200/19)^(1/2), -(3200/19)^(1/2) }

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