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D( x )
x+4 = 0
x+4 = 0
x+4 = 0
x+4 = 0 // - 4
x = -4
x in (-oo:-4) U (-4:+oo)
(14*x-14*x^3-840)/(x+4) = 0
14*x-14*x^3-840 = 0
14*(x-x^3-60) = 0
x-x^3-60 = 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
x = 1
x-x^3-60 = -60
1
-1
x = -1
x-x^3-60 = -60
-1
2
x = 2
x-x^3-60 = -66
2
-2
x = -2
x-x^3-60 = -54
-2
3
x = 3
x-x^3-60 = -84
3
-3
x = -3
x-x^3-60 = -36
-3
4
x = 4
x-x^3-60 = -120
4
-4
x = -4
x-x^3-60 = 0
-4
x+4
4*x-x^2-15
x-x^3-60
x+4
x^3+4*x^2
4*x^2+x-60
-4*x^2-16*x
-15*x-60
15*x+60
0
4*x-x^2-15 = 0
DELTA = 4^2-(-15*(-1)*4)
DELTA = -44
DELTA < 0
x in { -4}
14*(x+4) = 0
14 = 0
x belongs to the empty set
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