factor by grouping. there is a common 18x in the first two terms, and a common -9 in the last two
write as
now apply the formula for the difference of two squares factorization
begin by factoring out the common 6
now, what do you aee?
these are one of those two-way quadratic thingys.
here's a tip: forget the y for a while and treat it as
and factor that. when finished, attach a y to the constant terms, and that will take care of the y's in your expression
same advice as the last problem
treat this as
this is a quadratic in
, factor it as you would a quadratic. but instead of
you are using
if it is hard for you to visualize, let
, then you have
. factorize this, and then replace all the
's with
's