How do you factor by grouping #a^2+6b+9 - b^2 #?
May 27, 2015
This cannot be factorised by any grouping. Probably there is some misprint in the question. It should have been 6a instead of 6b. If this is so, then the given expression would become (a+3)^2 -b^2, which can be factorised as (a+3-b)(a+3+b)