2x+1/x-4

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Solution for 2x+1/x-4 equation: 


D( x )

x = 0

x = 0

x = 0

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

2*x+1/x-4 = 0

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

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

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

x^1

2*x^2-4*x+1 = 0

2*x^2-4*x+1 = 0

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

DELTA = 8

DELTA > 0

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

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

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

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

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