How do you factor #16x^2-1#?
Both 16 and 1 are squares. This suggests using the formula for the difference of squares.
As such it can be factorized as
You factor it as a difference of two squares.
Every time you have a difference in the format of
Then you have to identify if your quantity is the difference of two squared quantities.
It is. In fact we can write it as:
Then we can apply our rule
and these are your factors.