Answer:
I'm presuming its factors for a monic quadratic trinomial--of form :
X squared + BX + C . You need the numbers that MULTIPLY to give C and ADD up to give B
Eg X squared + 8X + 12 factors to ( X+2) (X + 6 )
BUT X squared + 7X + 12 factors to (X +3 )(X + 4)
Hope this helps. Phil.