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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/x = 11-(4*x) // - 11-(4*x)
4*x+6/x-11 = 0
4*x^1+6*x^-1-11*x^0 = 0
(4*x^2-11*x^1+6*x^0)/(x^1) = 0 // * x^2
x^1*(4*x^2-11*x^1+6*x^0) = 0
x^1
4*x^2-11*x+6 = 0
4*x^2-11*x+6 = 0
DELTA = (-11)^2-(4*4*6)
DELTA = 25
DELTA > 0
x = (25^(1/2)+11)/(2*4) or x = (11-25^(1/2))/(2*4)
x = 2 or x = 3/4
x in { 3/4, 2}
x in { 3/4, 2 }
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