Find the LCM of this set of polynomials- x^2-y^2, x^3+x^2y

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Caroline -If you don't have the book "Hot X: Algebra Exposed" by Danica McKellar, I suggest you pick up a copy or check one out at your local library.  Why?  Because she writes a great section on LCM and GCF.The answer to your problem is:LCM = (x+y)(x-y)(x^2)Read chapter 2 starting on page 15 of her book.  It will help you tremendously!