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D( X )
2*X+1 = 0
2*X+1 = 0
2*X+1 = 0
2*X+1 = 0 // - 1
2*X = -1 // : 2
X = -1/2
X in (-oo:-1/2) U (-1/2:+oo)
(4*X^3+12*X^2+11*X+6)/(2*X+1) = 0
4*X^3+12*X^2+11*X+6 = 0
4*X^3+12*X^2+11*X+6 = 0
{ 1, -1, 2, -2, 3, -3, 6, -6 }
1
X = 1
4*X^3+12*X^2+11*X+6 = 33
1
-1
X = -1
4*X^3+12*X^2+11*X+6 = 3
-1
2
X = 2
4*X^3+12*X^2+11*X+6 = 108
2
-2
X = -2
4*X^3+12*X^2+11*X+6 = 0
-2
X+2
4*X^2+4*X+3
4*X^3+12*X^2+11*X+6
X+2
-4*X^3-8*X^2
4*X^2+11*X+6
-4*X^2-8*X
3*X+6
-3*X-6
0
4*X^2+4*X+3 = 0
DELTA = 4^2-(3*4*4)
DELTA = -32
DELTA < 0
X in { -2}
X+2 = 0
(X+2)/(2*X+1) = 0
X+2 = 0 // - 2
X = -2
X = -2
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