SOLUTION: what is the factor for 27x^3+343y^3

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Question 689413: what is the factor for 27x^3+343y^3
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
27x%5E3%2B343y%5E3+

%283x%29%5E3%2B%287y%29%5E3+

%283x%2B7y%29%28%283x%29%5E2-%283x%29%287y%29%2B%287y%29%5E2%29+ Sum of cubes factoring rule

%283x%2B7y%29%289x%5E2-21xy%2B49y%5E2%29+

So 27x%5E3%2B343y%5E3+ factors to %283x%2B7y%29%289x%5E2-21xy%2B49y%5E2%29+