Are a2 – b2 and a2 + b2factors of a  b? 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. a2 – b2is called a difference of two squares
it factors into (a + b)(a  b) a2+ b2does not factor into anything, nor can anything be factored out of it.  Algebra House
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