x+4/x-8

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Solution for x+4/x-8 equation: 


D( x )

x = 0

x = 0

x = 0

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

x+4/x-8 = 0

1*x^1+4*x^-1-8*x^0 = 0

(1*x^2-8*x^1+4*x^0)/(x^1) = 0 // * x^2

x^1*(1*x^2-8*x^1+4*x^0) = 0

x^1

x^2-8*x+4 = 0

x^2-8*x+4 = 0

DELTA = (-8)^2-(1*4*4)

DELTA = 48

DELTA > 0

x = (48^(1/2)+8)/(1*2) or x = (8-48^(1/2))/(1*2)

x = (4*3^(1/2)+8)/2 or x = (8-4*3^(1/2))/2

x in { (8-4*3^(1/2))/2, (4*3^(1/2)+8)/2} 

x in { (8-4*3^(1/2))/2, (4*3^(1/2)+8)/2 }

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