SOLUTION: 25(x+y)^2-4(x-y)^2

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Question 634857: 25(x+y)^2-4(x-y)^2
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
25%28x%2By%29%5E2-4%28x-y%29%5E2

25%28x%5E2%2B2xy%2By%5E2%29-4%28x%5E2-2xy%2By%5E2%29

25x%5E2%2B50xy%2B25y%5E2-4x%5E2%2B8xy-4y%5E2

21x%5E2%2B58xy%2B21y%5E2
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So

25%28x%2By%29%5E2-4%28x-y%29%5E2

simplifies to

21x%5E2%2B58xy%2B21y%5E2

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