document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=90081>Question 90081</A>: <I><SPAN STYLE=\"word-break: break-all;\"> find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n </SPAN>\n" );
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document.write( "    find the value for k so that 9m^2-kn^2 will have the factors 3m+7n and 3m-7n\r<BR>\n" );
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document.write( "       If (3m+7n) and (3m-7n) are the factors  then (3m+7n)*(3m-7n)<BR>\n" );
document.write( "                                                   = (3m)^2 - (7n)^<BR>\n" );
document.write( "                                                   = 9m^2  -  49n^2<BR>\n" );
document.write( "                              Therefore 9m^2- kn^2 = 9m^2- 49n^2\r<BR>\n" );
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document.write( "                                         hence  k = 49 </SPAN>\n" );
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