(18/x)-4x=0

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Solution for (18/x)-4x=0 equation: 


D( x )

x = 0

x = 0

x = 0

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

18/x-(4*x) = 0

18/x-4*x = 0

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

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

x^1*(18*x^0-4*x^2) = 0

x^1

18-4*x^2 = 0

18-4*x^2 = 0

DELTA = 0^2-(-4*4*18)

DELTA = 288

DELTA > 0

x = (288^(1/2)+0)/(-4*2) or x = (0-288^(1/2))/(-4*2)

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

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

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

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