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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = x // - x
11/x-x = 0
11*x^-1-1*x^1 = 0
(11*x^0-1*x^2)/(x^1) = 0 // * x^2
x^1*(11*x^0-1*x^2) = 0
x^1
11-x^2 = 0
11-x^2 = 0
DELTA = 0^2-(-1*4*11)
DELTA = 44
DELTA > 0
x = (44^(1/2)+0)/(-1*2) or x = (0-44^(1/2))/(-1*2)
x = -11^(1/2) or x = 11^(1/2)
x in { -11^(1/2), 11^(1/2)}
x in { -11^(1/2), 11^(1/2) }
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