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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(11*x)+18/x-9 = 0
X^2-11*x+18/x-9 = 0
18*x^-1-11*x^1-9*x^0 = 0
(18*x^0-11*x^2-9*x^1)/(x^1) = 0 // * x^2
x^1*(18*x^0-11*x^2-9*x^1) = 0
x^1
18-11*x^2-9*x = 0
18-11*x^2-9*x = 0
DELTA = (-9)^2-(-11*4*18)
DELTA = 873
DELTA > 0
x = (873^(1/2)+9)/(-11*2) or x = (9-873^(1/2))/(-11*2)
x = (3*97^(1/2)+9)/(-22) or x = (9-3*97^(1/2))/(-22)
x in { (3*97^(1/2)+9)/(-22), (9-3*97^(1/2))/(-22)}
x in { (3*97^(1/2)+9)/(-22), (9-3*97^(1/2))/(-22) }
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