3x-11+1/x-8

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Solution for 3x-11+1/x-8 equation: 


D( x )

x = 0

x = 0

x = 0

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

3*x+1/x-11-8 = 0

3*x^1+1*x^-1-19*x^0 = 0

(3*x^2-19*x^1+1*x^0)/(x^1) = 0 // * x^2

x^1*(3*x^2-19*x^1+1*x^0) = 0

x^1

3*x^2-19*x+1 = 0

3*x^2-19*x+1 = 0

DELTA = (-19)^2-(1*3*4)

DELTA = 349

DELTA > 0

x = (349^(1/2)+19)/(2*3) or x = (19-349^(1/2))/(2*3)

x = (349^(1/2)+19)/6 or x = (19-349^(1/2))/6

x in { (19-349^(1/2))/6, (349^(1/2)+19)/6} 

x in { (19-349^(1/2))/6, (349^(1/2)+19)/6 }

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