7/4=(120/x)^2

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Solution for 7/4=(120/x)^2 equation: 


D( x )

x = 0

x = 0

x = 0

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

7/4 = (120/x)^2 // - (120/x)^2

7/4-(120/x)^2 = 0

-14400*x^-2 = -7/4 // : -14400

x^-2 = 7/57600

-2 < 0

1/(x^2) = 7/57600 // * x^2

1 = 7/57600*x^2 // : 7/57600

57600/7 = x^2

x^2 = 57600/7 // ^ 1/2

abs(x) = (57600/7)^(1/2)

x = (57600/7)^(1/2) or x = -(57600/7)^(1/2)

x in { (57600/7)^(1/2), -(57600/7)^(1/2) }

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