2x-5-x-8/x+4

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Solution for 2x-5-x-8/x+4 equation: 


D( x )

x = 0

x = 0

x = 0

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

2*x-x-(8/x)-5+4 = 0

2*x-x-8*x^-1-5+4 = 0

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

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

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

x^1

x^2-x-8 = 0

x^2-x-8 = 0

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

DELTA = 33

DELTA > 0

x = (33^(1/2)+1)/(1*2) or x = (1-33^(1/2))/(1*2)

x = (33^(1/2)+1)/2 or x = (1-33^(1/2))/2

x in { (1-33^(1/2))/2, (33^(1/2)+1)/2} 

x in { (1-33^(1/2))/2, (33^(1/2)+1)/2 }

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