Subtract x, minus, 4x−4 from minus, 8, x, squared, minus, 8−8x 2 −8.

To simplify the expression, we can combine like terms.

Starting with the expression:
8x^2 - 8 - 8x^2 - 8

First, let's group the like terms together:
(8x^2 - 8x^2) + (-8 - 8)

Now, let's simplify each group:
(0) + (-16)

Finally, we add the two numbers together:
0 - 16 = -16

So, subtracting x-4x-4 from 8x^2 - 8 - 8x^2 - 8 results in -16.