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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^2-(3*x)-(16/x) = 0
x^2-3*x-16*x^-1 = 0
1*x^2-3*x^1-16*x^-1 = 0
(1*x^3-3*x^2-16*x^0)/(x^1) = 0 // * x^2
x^1*(1*x^3-3*x^2-16*x^0) = 0
x^1
x^3-3*x^2-16 = 0
{ 1, -1, 2, -2, 4, -4, 8, -8, 16, -16 }
1
x = 1
x^3-3*x^2-16 = -18
1
-1
x = -1
x^3-3*x^2-16 = -20
-1
2
x = 2
x^3-3*x^2-16 = -20
2
-2
x = -2
x^3-3*x^2-16 = -36
-2
4
x = 4
x^3-3*x^2-16 = 0
4
x-4
x^2+x+4
x^3-3*x^2-16
x-4
4*x^2-x^3
x^2-16
4*x-x^2
4*x-16
16-4*x
0
x^2+x+4 = 0
DELTA = 1^2-(1*4*4)
DELTA = -15
DELTA < 0
x in { 4}
x = 4
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