SOLUTION: factor 9x^4-81y^2

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Question 521177: factor 9x^4-81y^2
Answer by jim_thompson5910(35256) About Me  (Show Source):
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9x%5E4-81y%5E2


9%28x%5E4-9y%5E2%29


9%28%28x%5E2%29%5E2-%283y%29%5E2%29


9%28x%5E2-3y%29%28x%5E2%2B3y%29 Use the difference of squares factoring formula here.


So 9x%5E4-81y%5E2 factors to 9%28x%5E2-3y%29%28x%5E2%2B3y%29


In other words, 9x%5E4-81y%5E2=9%28x%5E2-3y%29%28x%5E2%2B3y%29

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