Answer:
Find the factors of c that add up to b.
Explanation:
For example, if you were factoring
x^2 + 12x + 35
a=1
b=12
c=35
In order to factor, we're looking for what multiplies to 35, and adds up to 12. What multiplies to 35 are the factors of 35. In this case its 5 and 7.
5 × 7 = 35
5 + 7 = 12
So you could factor
x^2 + 12x + 35
= (x + 5)(x + 7)