#### Answer

greatest common factor

#### Work Step by Step

Always start factoring by searching for a GCF (other than 1)....
so we can factor it out first, and then continue to factor the expression that remains in the parentheses
Example
$2x^{2}+4x-6=....$
$=2(x^{2}+2x-3)$
... and we continue to factor the trinomial that has 1 as the leading coefficient....