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D( x )
(x-4)^2 = 0
(x-4)^2 = 0
(x-4)^2 = 0
x-4 = 0 // + 4
x = 4
x in (-oo:4) U (4:+oo)
(2*x^2-16)/((x-4)^2) = 0
2*x^2 = 16 // : 2
x^2 = 8
x^2 = 8 // ^ 1/2
abs(x) = 2*2^(1/2)
x = 2*2^(1/2) or x = -(2*2^(1/2))
x in { 2*2^(1/2), -(2*2^(1/2)) }
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