document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=628948>Question 628948</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Having a problem figuring out this algebra. Any help will be appreciated thanks\r<BR>\n" );
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document.write( "(4+8i)(4-8i) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #395910 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=395910\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Having a problem figuring out this algebra. Any help will be appreciated thanks <BR>\n" );
document.write( "(4+8i)(4-8i)<BR>\n" );
document.write( "**<BR>\n" );
document.write( "You should recognize this the factored form of the difference of two squares which go like this:<BR>\n" );
document.write( "(a+b)(a-b)=a^2-b^2<BR>\n" );
document.write( "..<BR>\n" );
document.write( "(4+8i)(4-8i)<BR>\n" );
document.write( "=4^2-(8i)^2<BR>\n" );
document.write( "=16-64i^2<BR>\n" );
document.write( "i^2=-1<BR>\n" );
document.write( "=16+64<BR>\n" );
document.write( "=80 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );