How do you factor the expression #-v²+2v-1#?
1) First, factor out a -1. (Keep in mind this will change all signs in the equation, not just the first one.)
2) To get a negative number in the center, and a positive on the outer, you'll need two negative numbers. The only way to get -2 from from +1 is -1x-1.
3) Simplified as
4) There is no = so it cannot be solved farther.