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D( a )
a+6 = 0
a+6 = 0
a+6 = 0
a+6 = 0 // - 6
a = -6
a in (-oo:-6) U (-6:+oo)
(a^3-(26*a)+60)/(a+6) = 0
(a^3-26*a+60)/(a+6) = 0
a^3-26*a+60 = 0
a^3-26*a+60 = 0
{ 1, -1, 2, -2, 3, -3, 4, -4, 5, -5, 6, -6, 10, -10, 12, -12, 15, -15, 20, -20, 30, -30, 60, -60 }
1
a = 1
a^3-26*a+60 = 35
1
-1
a = -1
a^3-26*a+60 = 85
-1
2
a = 2
a^3-26*a+60 = 16
2
-2
a = -2
a^3-26*a+60 = 104
-2
3
a = 3
a^3-26*a+60 = 9
3
-3
a = -3
a^3-26*a+60 = 111
-3
4
a = 4
a^3-26*a+60 = 20
4
-4
a = -4
a^3-26*a+60 = 100
-4
5
a = 5
a^3-26*a+60 = 55
5
-5
a = -5
a^3-26*a+60 = 65
-5
6
a = 6
a^3-26*a+60 = 120
6
-6
a = -6
a^3-26*a+60 = 0
-6
a+6
a^2-6*a+10
a^3-26*a+60
a+6
-a^3-6*a^2
60-6*a^2-26*a
6*a^2+36*a
10*a+60
-10*a-60
0
a^2-6*a+10 = 0
DELTA = (-6)^2-(1*4*10)
DELTA = -4
DELTA < 0
a in { -6}
a+6 = 0
1 = 0
a belongs to the empty set
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