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D( b )
b+4 = 0
b+4 = 0
b+4 = 0
b+4 = 0 // - 4
b = -4
b in (-oo:-4) U (-4:+oo)
(2*b^3-(9*b^2)-(9*b)-11)/(b+4) = 0
(2*b^3-9*b^2-9*b-11)/(b+4) = 0
2*b^3-9*b^2-9*b-11 = 0
2*b^3-9*b^2-9*b-11 = 0
{ 1, -1, 11, -11 }
1
b = 1
2*b^3-9*b^2-9*b-11 = -27
1
-1
b = -1
2*b^3-9*b^2-9*b-11 = -13
-1
11
b = 11
2*b^3-9*b^2-9*b-11 = 1463
11
-11
b = -11
2*b^3-9*b^2-9*b-11 = -3663
-11
{ 1/2, -1/2, -1/2, 1/2, 11/2, -11/2, -11/2, 11/2 }
1/2
b
1/2
2*b^3-9*b^2-9*b-11 = -17.5
1/2
-1/2
b
-1/2
2*b^3-9*b^2-9*b-11 = -9
-1/2
-1/2
b
-1/2
2*b^3-9*b^2-9*b-11 = -9
-1/2
1/2
b
1/2
2*b^3-9*b^2-9*b-11 = -17.5
1/2
11/2
b
11/2
2*b^3-9*b^2-9*b-11 = 0
11/2
b-11/2
2*b^2+2*b+2
2*b^3-9*b^2-9*b-11
b-11/2
11*b^2-2*b^3
2*b^2-9*b-11
11*b-2*b^2
2*b-11
11-2*b
0
2*b^2+2*b+2 = 0
DELTA = 2^2-(2*2*4)
DELTA = -12
DELTA < 0
b in { 11/2}
b-11/2 = 0
(b-11/2)/(b+4) = 0
b-11/2 = 0 // + 11/2
b = 11/2
b = 11/2
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