How do you factor the polynomial 225x^2-144y^2? I know what the answer is I'm just not sure how they got it.

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Nancy -Did you recognize this important special factor formula:Apply this formula to your problem:Now, you might notice that you can further factor out a 3 from both of these factors:3(5x+4y)3(5x-4y)=9(5x+4y)(5x-4y)Hope that helps