document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=138193>Question 138193</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0072831065/algebrahomeworkh></A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> Perform the indicated operations. write the answer in the form a + bi.\r<BR>\n" );
document.write( "\n" );
document.write( "(-3-8i)(-3+8i)\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #100905 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=100905\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Perform the indicated operations. write the answer in the form a + bi. <BR>\n" );
document.write( "(-3-8i)(-3+8i) <BR>\n" );
document.write( "-------------------<BR>\n" );
document.write( "You could use FOIL but you should see the problem in in the form<BR>\n" );
document.write( "(a-b)(a+b) which equals a^2 - b^2<BR>\n" );
document.write( "--------------------<BR>\n" );
document.write( "So your answer is (-3)^2 - (8i)^2 = 9+64=73<BR>\n" );
document.write( "In other words (a-bi)(a+bi) = a^2 + b^2<BR>\n" );
document.write( "=============================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );