Question

lim x approaches -1 (x^2-4x) / (x^2-3x-4)

Answer 1

have you tried factoring both top and bottom
to see if anything cancels? you should do this if you have 0/0
do you have 0/0 when you evaluate the function at x=-1?

Answer 2

you could still factor of course top and bottom (and cancel any common factors on top and bottom) even if you don't have 0/0
to get better idea of what the graph looks like

Answer 3

The point is that is where I would start.
Factoring.