document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1200167>Question 1200167</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I know the chosen topic has nothing to do with this but I couldn’t find the topic for this problem.\r<BR>\n" );
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document.write( "Use polynomial identities and number properties to perform the calculation.<BR>\n" );
document.write( "109^2 </SPAN>\n" );
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document.write( "Treat 109 as 100+9\r<BR>\n" );
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document.write( "The task of computing 109^2 is the same as (100+9)^2\r<BR>\n" );
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document.write( "Then use the identity<BR>\n" );
document.write( "(a+b)^2 = a^2 + 2ab + b^2<BR>\n" );
document.write( "where <BR>\n" );
document.write( "a = 100<BR>\n" );
document.write( "b = 9<BR>\n" );
document.write( "I'll let the student perform the computation.\r<BR>\n" );
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document.write( "A similar example:<BR>\n" );
document.write( "27^2 = (20+7)^2<BR>\n" );
document.write( "27^2 = 20^2 + 2*20*7 + 7^2<BR>\n" );
document.write( "27^2 = 400 + 280 + 49<BR>\n" );
document.write( "27^2 = 680 + 49<BR>\n" );
document.write( "27^2 = 729<BR>\n" );
document.write( "You can use a calculator to confirm.<BR>\n" );
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