Question

How do you factor `49u^2 - (x-y) ^2`?

Answer 1

It is

`49u^2 - (x-y) ^2=(7u)^2-(x-y)^2=[7u+(x-y)]*[7*u-(x-y)]`

We make use of `a^2-b^2=(a+b)*(a-b)`