18-4200/x^2

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Solution for 18-4200/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)

18-(4200/(x^2)) = 0

18-4200*x^-2 = 0

-4200*x^-2 = -18 // : -4200

x^-2 = 3/700

-2 < 0

1/(x^2) = 3/700 // * x^2

1 = 3/700*x^2 // : 3/700

700/3 = x^2

x^2 = 700/3 // ^ 1/2

abs(x) = (700/3)^(1/2)

x = (700/3)^(1/2) or x = -(700/3)^(1/2)

x in { (700/3)^(1/2), -(700/3)^(1/2) }

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