SOLUTION: factor completely. 16-81a^4

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Question 643996: factor completely. 16-81a^4
Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
factor completely. 16-81a^4
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It's a difference of 2 squares.
a%5E2+-+b%5E2+=+%28a-b%29%2A%28a%2Bb%29
Start with that.