2x-9/x-2

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Solution for 2x-9/x-2 equation: 


D( x )

x = 0

x = 0

x = 0

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

2*x-(9/x)-2 = 0

2*x-9*x^-1-2 = 0

2*x^1-9*x^-1-2*x^0 = 0

(2*x^2-2*x^1-9*x^0)/(x^1) = 0 // * x^2

x^1*(2*x^2-2*x^1-9*x^0) = 0

x^1

2*x^2-2*x-9 = 0

2*x^2-2*x-9 = 0

DELTA = (-2)^2-(-9*2*4)

DELTA = 76

DELTA > 0

x = (76^(1/2)+2)/(2*2) or x = (2-76^(1/2))/(2*2)

x = (2*19^(1/2)+2)/4 or x = (2-2*19^(1/2))/4

x in { (2-2*19^(1/2))/4, (2*19^(1/2)+2)/4} 

x in { (2-2*19^(1/2))/4, (2*19^(1/2)+2)/4 }

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