PSAT #2, Section 3, #16
OK, so you’re told that is a factor of
. You need to find
. To do so, you’ll need to set up a classic FOIL scenario. I’m going to use
and
for the unknowns in the second factor.
Now remember what happens when you FOIL. The and the
will combine to make the
, and the
will combine with the second
to make
. Therefore, it must be true that
and
. We can use that information to solve for
.