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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x)/x-((6/6)*x^2)-(2*3*x) = 0
(3*x)/x-x^2-6*x = 0
3-x^2-6*x = 0
DELTA = (-6)^2-(-1*3*4)
DELTA = 48
DELTA > 0
x = (48^(1/2)+6)/(-1*2) or x = (6-48^(1/2))/(-1*2)
x = (4*3^(1/2)+6)/(-2) or x = (6-4*3^(1/2))/(-2)
x in { (4*3^(1/2)+6)/(-2), (6-4*3^(1/2))/(-2) }
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