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D( r )
r-7 = 0
r-7 = 0
r-7 = 0
r-7 = 0 // + 7
r = 7
r in (-oo:7) U (7:+oo)
(6*r^3-(35*r^2)-(44*r)-35)/(r-7) = 0
(6*r^3-35*r^2-44*r-35)/(r-7) = 0
6*r^3-35*r^2-44*r-35 = 0
6*r^3-35*r^2-44*r-35 = 0
{ 1, -1, 5, -5, 7, -7, 35, -35 }
1
r = 1
6*r^3-35*r^2-44*r-35 = -108
1
-1
r = -1
6*r^3-35*r^2-44*r-35 = -32
-1
5
r = 5
6*r^3-35*r^2-44*r-35 = -380
5
-5
r = -5
6*r^3-35*r^2-44*r-35 = -1440
-5
7
r = 7
6*r^3-35*r^2-44*r-35 = 0
7
r-7
6*r^2+7*r+5
6*r^3-35*r^2-44*r-35
r-7
42*r^2-6*r^3
7*r^2-44*r-35
49*r-7*r^2
5*r-35
35-5*r
0
6*r^2+7*r+5 = 0
DELTA = 7^2-(4*5*6)
DELTA = -71
DELTA < 0
r in { 7}
r-7 = 0
1 = 0
r belongs to the empty set
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