This question can be done with or without the TI-84.
Notice in answer (1) that -8 x -8 will give +64 which does not match the trinomial
Notice in answer (2) that FOIL’s Outer and Inner +8m – 8m which will cancel out the middle term and does not match -12m
In (3) and (4), we are looking for the middle terms that add up to -12m we just have to watch our signs!
That’s it — that’s two points!
To check work with a TI-83/4, put m^2 – 12m -64 into Y1 and then try each of the others into Y2.
Check the graph and the tables…when you find the match, that is David’s correct factoring!