Janna Hi! I was just wondering how you would factor x^{2}  9y^{2}. Thanks! Hi Janna,To be able to factoring you need to know a few basic facts and then recognize some patterns. For your problem the fact is the difference of squares formula, The "pattern recognition" part is seeing x^{2}  9y^{2} as a difference of squares. That is you need to see Harley
