document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1168764>Question 1168764</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 1. If x + y = 17 and x^2 + y^2 = 167, what is the value of 3xy?\r<BR>\n" );
document.write( "\n" );
document.write( "2. If x + y = 13 and xy = 17, what is the value of 2(x^2+y^2)?\r<BR>\n" );
document.write( "\n" );
document.write( "3. If r^2 + s^2 = 18, and r + s = 5, what is the value of 4rs?\r<BR>\n" );
document.write( "\n" );
document.write( "4. If x  + y = 17 and x^2 + y^2 = 167, what is the value of 3xy?\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #793383 by </B><A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><B>josgarithmetic(39620)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josgarithmetic><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=793383\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%2By%29%5E2=17%5E2 ALIGN=MIDDLE  ALT=\"%28x%2By%29%5E2=17%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2%2By%5E2%2B2xy=289 ALIGN=MIDDLE  ALT=\"x%5E2%2By%5E2%2B2xy=289\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=167%2B2xy=289 ALIGN=MIDDLE  ALT=\"167%2B2xy=289\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=xy=61 ALIGN=MIDDLE  ALT=\"xy=61\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=3%2Axy=%283%29%2861%29 ALIGN=MIDDLE  ALT=\"3%2Axy=%283%29%2861%29\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "----<BR>\n" );
document.write( "----<BR>\n" );
document.write( "What about #2 and #3?\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Use #1, done here already, as a guide.  Think!   #1 and #3  are similar.  \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "---\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "#2, just a start,<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x%2By%29%5E2=169 ALIGN=MIDDLE  ALT=\"%28x%2By%29%5E2=169\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2%2By%5E2%2B2xy=169 ALIGN=MIDDLE  ALT=\"x%5E2%2By%5E2%2B2xy=169\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "substitute using the other given equation,...<BR>\n" );
document.write( "... </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );