Simplify

Assuming that $x \neq -3$, simplify $(8x - 4)(x + 3) - (4x - 44)(2x + 6)$.

$8x^2+20x-12 - (8x^2-64x-264)$

$8x^2-8x^2+20x+64x-12+264$

$0x^2+84x+252$

$84x+252$

The fact that $x \neq -3$ is not necessary, it only shows that the expression is not equal to $0$.