document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=185376>Question 185376</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/1602773033/algebrahomeworkh>saxon algebra 2</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> c^2=13^2+20^2-2(13)(20)cos27<BR>\n" );
document.write( "This is where I don't understand.  I know the answer is c^2=105.68, but when I work it out I get 720.9121805, which is nowhere the correct answer.  I am working it straight across.  What am I doing wrong?  Please help! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #139078 by </B><A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><B>jim_thompson5910(35256)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=jim_thompson5910><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=139078\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> It's possible that you are working in radian mode where you actually want to work in degree mode. \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=13%5E2%2B20%5E2-2%2813%29%2820%29cos%2827%29 ALIGN=MIDDLE  ALT=\"c%5E2=13%5E2%2B20%5E2-2%2813%29%2820%29cos%2827%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Start with the given equation.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=169%2B400-2%2813%29%2820%29cos%2827%29 ALIGN=MIDDLE  ALT=\"c%5E2=169%2B400-2%2813%29%2820%29cos%2827%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Square each term.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=169%2B400-2%2813%29%2820%29%280.891%29 ALIGN=MIDDLE  ALT=\"c%5E2=169%2B400-2%2813%29%2820%29%280.891%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Evaluate the cosine of 27 to get 0.891 (if you get a different value, then you're in the wrong mode).\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=169%2B400-463.32 ALIGN=MIDDLE  ALT=\"c%5E2=169%2B400-463.32\"   DISABLED_style= \"max-width:90%; height:auto;\" > Multiply\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=105.68 ALIGN=MIDDLE  ALT=\"c%5E2=105.68\"   DISABLED_style= \"max-width:90%; height:auto;\" > Combine like terms.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So you're answer is confirmed to be <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=c%5E2=105.68 ALIGN=MIDDLE  ALT=\"c%5E2=105.68\"   DISABLED_style= \"max-width:90%; height:auto;\" > </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );