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D( x )
x-3 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:3) U (3:+oo)
(6*x^3-(22*x^2)+21*x-27)/(x-3) = 0
(6*x^3-22*x^2+21*x-27)/(x-3) = 0
6*x^3-22*x^2+21*x-27 = 0
6*x^3-22*x^2+21*x-27 = 0
{ 1, -1, 3, -3, 9, -9, 27, -27 }
1
x = 1
6*x^3-22*x^2+21*x-27 = -22
1
-1
x = -1
6*x^3-22*x^2+21*x-27 = -76
-1
3
x = 3
6*x^3-22*x^2+21*x-27 = 0
3
x-3
6*x^2-4*x+9
6*x^3-22*x^2+21*x-27
x-3
18*x^2-6*x^3
21*x-4*x^2-27
4*x^2-12*x
9*x-27
27-9*x
0
6*x^2-4*x+9 = 0
DELTA = (-4)^2-(4*6*9)
DELTA = -200
DELTA < 0
x in { 3}
x-3 = 0
1 = 0
x belongs to the empty set
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