2*(240/x)-x=4

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Solution for 2*(240/x)-x=4 equation: 


D( x )

x = 0

x = 0

x = 0

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

2*(240/x)-x = 4 // - 4

2*(240/x)-x-4 = 0

480*x^-1-1*x^1-4*x^0 = 0

(480*x^0-1*x^2-4*x^1)/(x^1) = 0 // * x^2

x^1*(480*x^0-1*x^2-4*x^1) = 0

x^1

480-x^2-4*x = 0

480-x^2-4*x = 0

DELTA = (-4)^2-(-1*4*480)

DELTA = 1936

DELTA > 0

x = (1936^(1/2)+4)/(-1*2) or x = (4-1936^(1/2))/(-1*2)

x = -24 or x = 20

x in { -24, 20} 

x in { -24, 20 }

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