document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=313989>Question 313989</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A rectangular pool is 30 feet wide and 40 feet long.  It is surrounded on all four sides by a wooden deck that is x feet wide.  The total area enclosed within the perimeter of the deck is 3000ft^2.  What is the width of the deck? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #224490 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=224490\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (30+2x)(40+2x)=3,000<BR>\n" );
document.write( "1,200+80x+60x+4x^2=3,000<BR>\n" );
document.write( "4x^2+140x+1,200-3,000=0<BR>\n" );
document.write( "4x^2+140x-1800=0<BR>\n" );
document.write( "(2x-20)(2x+90)=0<BR>\n" );
document.write( "2x-20=0<BR>\n" );
document.write( "2x=20<BR>\n" );
document.write( "x=20/2<BR>\n" );
document.write( "x=10 ft. ans. for the width of the wooden deck.<BR>\n" );
document.write( "Proof:<BR>\n" );
document.write( "(30+2*10)(40+2*10)=3,000<BR>\n" );
document.write( "(30+20)(40+20)=3,000<BR>\n" );
document.write( "50*60= 3,000<BR>\n" );
document.write( "3,000=3,000 </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );