document.write( "Question 116476: Find a value for k so that 9m^2-kn^2 will have the factors 3m + 7n and 3m -7n \n" ); document.write( "
Algebra.Com's Answer #84685 by rapaljer(4671)\"\" \"About 
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Take the product of the two given factors:
\n" ); document.write( "\"%283m+%2B+7n%29%283m+-7n%29\"\r
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\n" ); document.write( "\n" ); document.write( "That would be \"9m%5E2+-49n%5E2\"\r
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\n" ); document.write( "\n" ); document.write( "I guess that means that k has to be 49, right???\r
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\n" ); document.write( "\n" ); document.write( "R^2 Retired
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