To simplify the expression (2x^2 - 128) / (x^3 - 16x^2 + 64x), first factor the numerator and denominator.

Factor the numerator:
2x^2 - 128 = 2(x^2 - 64) = 2(x - 8)(x + 8)

Factor the denominator:
x^3 - 16x^2 + 64x = x(x^2 - 16x + 64) = x(x - 8)^2

Now, the expression becomes:
(2(x - 8)(x + 8)) / (x(x - 8)^2)

We can simplify this expression further by cancelling out the common factors in the numerator and denominator:
= 2(x + 8) / (x(x - 8))

Therefore, the simplified form of the expression is 2(x + 8) / (x(x - 8)).