posted by MissPatte .
This is giving me a lot of trouble.
Factoring Differences of Squares
and can you explain how you got the common factor if there is one please
just recall that a^2-b^2 = (a-b)(a+b)
So, first, make sure that both terms are perfect squares.
In this case, they are not. However, if you factor out a 2, you have
49 is 7^2 and 4w^2 = (2w)^2. So, we now have