Perform the operation of (-4x^2 + 4x) + (-6x^2 - 8)

To perform the operation, we simply combine like terms.

(-4x^2 + 4x) + (-6x^2 - 8)

First, let's combine the terms with x^2:
(-4x^2 - 6x^2) + (4x) + (-8)
This simplifies to:
-10x^2 + 4x - 8.

So, the result of the operation is -10x^2 + 4x - 8.