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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3 = ((6*x^2-x^3)/6)/x // - ((6*x^2-x^3)/6)/x
3-(((6*x^2-x^3)/6)/x) = 0
(-1*(6*x^2-x^3))/(6*x)+3 = 0
(-1*(6*x^2-x^3))/(6*x)+(3*6*x)/(6*x) = 0
3*6*x-1*(6*x^2-x^3) = 0
x^3-6*x^2+18*x = 0
x^3-6*x^2+18*x = 0
x*(x^2-6*x+18) = 0
x^2-6*x+18 = 0
DELTA = (-6)^2-(1*4*18)
DELTA = -36
DELTA < 0
x = 0
x/(6*x) = 0
x/(6*x) = 0 // * 6*x
x = 0
x = 0
x in { 0}
x belongs to the empty set
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