1. The problem statement, all variables and given/known data Lim x^2-16/4-x x→4 2. Relevant equations 3. The attempt at a solution I factored it, and ended up with (x-4)(x+4)/(4-x) Cant cancel anything out, so I plug in 4 back into it, and end up with 8 as the limit. But the book says that the answer is -8?