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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3*x-(3*x)-(2/1) = x-(6/x)+9 // - x-(6/x)+9
3*x-(3*x)-x+6/x-(2/1)-9 = 0
3*x-3*x-x+6/x-9-2 = 0
6*x^-1-1*x^1-11*x^0 = 0
(6*x^0-1*x^2-11*x^1)/(x^1) = 0 // * x^2
x^1*(6*x^0-1*x^2-11*x^1) = 0
x^1
6-x^2-11*x = 0
6-x^2-11*x = 0
DELTA = (-11)^2-(-1*4*6)
DELTA = 145
DELTA > 0
x = (145^(1/2)+11)/(-1*2) or x = (11-145^(1/2))/(-1*2)
x = (145^(1/2)+11)/(-2) or x = (11-145^(1/2))/(-2)
x in { (145^(1/2)+11)/(-2), (11-145^(1/2))/(-2)}
x in { (145^(1/2)+11)/(-2), (11-145^(1/2))/(-2) }
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