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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
11/x = 4*x // - 4*x
11/x-(4*x) = 0
11/x-4*x = 0
11*x^-1-4*x^1 = 0
(11*x^0-4*x^2)/(x^1) = 0 // * x^2
x^1*(11*x^0-4*x^2) = 0
x^1
11-4*x^2 = 0
11-4*x^2 = 0
DELTA = 0^2-(-4*4*11)
DELTA = 176
DELTA > 0
x = (176^(1/2)+0)/(-4*2) or x = (0-176^(1/2))/(-4*2)
x = (-11^(1/2))/2 or x = (1*11^(1/2))/2
x in { (-11^(1/2))/2, (1*11^(1/2))/2}
x in { (-11^(1/2))/2, (1*11^(1/2))/2 }
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