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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(8*x)-(16/x)-4 = 0
X^2-8*x-16*x^-1-4 = 0
-8*x^1-16*x^-1-4*x^0 = 0
(-8*x^2-4*x^1-16*x^0)/(x^1) = 0 // * x^2
x^1*(-8*x^2-4*x^1-16*x^0) = 0
x^1
-8*x^2-4*x-16 = 0
-8*x^2-4*x-16 = 0
DELTA = (-4)^2-(-16*(-8)*4)
DELTA = -496
DELTA < 0
x in { }
x belongs to the empty set
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