document.write( "Question 1047131: Factor this expression as a difference of squares. a^2+4a-b^2\r
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Algebra.Com's Answer #662633 by solver91311(24713)\"\" \"About 
You can put this solution on YOUR website!
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\n" ); document.write( "\n" ); document.write( "Already answered this question.\r
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\n" ); document.write( "\n" ); document.write( "John
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\n" ); document.write( "My calculator said it, I believe it, that settles it
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