To factor -5v^2+31v-6, we need to find two numbers that multiply to give -30 (-5 x 6) and add up to 31. These numbers are 30 and 1. We can then rewrite the middle term using these numbers and factor by grouping:
-5v^2+30v+v-6
= -5v(v-6)+(v-6)
= (v-6)(-5v+1)
Therefore, -5v^2+31v-6 can be factored as (v-6)(-5v+1).