document.write( "Question 643996: factor completely. 16-81a^4 \n" ); document.write( "
Algebra.Com's Answer #404748 by Alan3354(69443)\"\" \"About 
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factor completely. 16-81a^4
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\n" ); document.write( "It's a difference of 2 squares.
\n" ); document.write( "\"a%5E2+-+b%5E2+=+%28a-b%29%2A%28a%2Bb%29\"
\n" ); document.write( "Start with that.
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