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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(10/x)-11 = 0
x-10*x^-1-11 = 0
1*x^1-10*x^-1-11*x^0 = 0
(1*x^2-11*x^1-10*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^2-11*x^1-10*x^0) = 0
x^1
x^2-11*x-10 = 0
x^2-11*x-10 = 0
DELTA = (-11)^2-(-10*1*4)
DELTA = 161
DELTA > 0
x = (161^(1/2)+11)/(1*2) or x = (11-161^(1/2))/(1*2)
x = (161^(1/2)+11)/2 or x = (11-161^(1/2))/2
x in { (11-161^(1/2))/2, (161^(1/2)+11)/2}
x in { (11-161^(1/2))/2, (161^(1/2)+11)/2 }
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