Question 1029601
The first step in any factoring problem is to factor out any greatest common factor first...here we get
{{{2(x-2y)^2 - 18z^2}}} =
{{{2((x-2y)^2 - 9z^2)}}} =
Now we look for a sum times a difference...
{{{2(x - 2y + 3z)(x - 2y - 3z)}}}