document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=304888>Question 304888</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a rectangular garden 10 feet wide and 12 feet long is surrounded by a rock border of uniform width. the area of the garden and rock border combined is 168 square feet. what is the width of the rock border? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #218342 by </B><A HREF=/tutors/aboutme.mpl?userid=checkley77><B>checkley77(12844)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=checkley77><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=218342\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (10+2x)(12+2x)=168<BR>\n" );
document.write( "120+44x+4x^2-168=0<BR>\n" );
document.write( "4x^2+44x-48=0<BR>\n" );
document.write( "4(x^2+11x-12)=0<BR>\n" );
document.write( "4(x+12)(x-1)=0<BR>\n" );
document.write( "x-1=0<BR>\n" );
document.write( "x=1 ft. ans. for the width of the rock border.<BR>\n" );
document.write( "Proof:<BR>\n" );
document.write( "(10+2*1)(12+2*1)=168<BR>\n" );
document.write( "(10+2)(12+2)=168<BR>\n" );
document.write( "12*14=168<BR>\n" );
document.write( "168=168 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );