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D( x )
9*x+3 = 0
9*x+3 = 0
9*x+3 = 0
9*x+3 = 0 // - 3
9*x = -3 // : 9
x = -3/9
x = -1/3
x in (-oo:-1/3) U (-1/3:+oo)
(27*x^3-(63*x^2)-(51*x)-9)/(9*x+3) = 0
(27*x^3-63*x^2-51*x-9)/(9*x+3) = 0
27*x^3-63*x^2-51*x-9 = 0
3*(9*x^3-21*x^2-17*x-3) = 0
9*x^3-21*x^2-17*x-3 = 0
{ 1, -1, 3, -3 }
1
x = 1
9*x^3-21*x^2-17*x-3 = -32
1
-1
x = -1
9*x^3-21*x^2-17*x-3 = -16
-1
3
x = 3
9*x^3-21*x^2-17*x-3 = 0
3
x-3
9*x^2+6*x+1
9*x^3-21*x^2-17*x-3
x-3
27*x^2-9*x^3
6*x^2-17*x-3
18*x-6*x^2
x-3
3-x
0
9*x^2+6*x+1 = 0
DELTA = 6^2-(1*4*9)
DELTA = 0
x = -6/(2*9)
x = -1/3 or x = -1/3
x in { -1/3, -1/3, 3}
3*(x+1/3)^2*(x-3) = 0
(3*(x+1/3)^2*(x-3))/(9*x+3) = 0
( x+1/3 )
x+1/3 = 0 // - 1/3
x = -1/3
( x-3 )
x-3 = 0 // + 3
x = 3
x in { -1/3}
x = 3
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