Do I then take the $-1$ as the answer or the $+1$? I'm asking because in my situation the velocity is going in the opposite direction than what the positive direction was deemed to be. Do I just take the $-1$, or do I take the $+1$ and then assign a direction sign ($-1$) to it. And why?

edit:
The object goes from A to B in the positive right direction, hits a wall at B with velocity $1.4m/s$ , goes back from B to A with initial velocity $-1m/s$.