I'm thinking the first one is because of the subtraction, but I'm not sure,
welcome to any ideas if you're not sure, just need a start on this,
and if you don’t know, possibly the term for this type of problem
so I can look in my book for it.
it factors into (a + b)(a - b)
a2+ b2does not factor into anything, nor can anything be
factored out of it.
- Algebra House