document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=134416>Question 134416</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The width of a painting is 4 inches less than the length, and the surface area is 320 square inches. Find the leng </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #98311 by </B><A HREF=/tutors/aboutme.mpl?userid=vleith><B>vleith(2983)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=vleith><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=98311\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What is the formula for the area of a rectangle?  Area = length * width.\r<BR>\n" );
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document.write( "Let length = l. <BR>\n" );
document.write( "Given: width = length - 4, Area = 320<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+l%2Aw ALIGN=MIDDLE  ALT=\"A+=+l%2Aw\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+l+%2A+%28l-4%29 ALIGN=MIDDLE  ALT=\"A+=+l+%2A+%28l-4%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=320+=+l%5E2+-4l ALIGN=MIDDLE  ALT=\"320+=+l%5E2+-4l\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0+=+l%5E2+-4l+-+320 ALIGN=MIDDLE  ALT=\"0+=+l%5E2+-4l+-+320\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0+=+%28l+%2B+16%29%28l+-+20%29 ALIGN=MIDDLE  ALT=\"0+=+%28l+%2B+16%29%28l+-+20%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "l = -16 , l = 20.\r<BR>\n" );
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document.write( "Since the length cannot be negative, the only solution that 'makes sense' is l = 20.\r<BR>\n" );
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document.write( "Check your answer. If l = 20, then width = 20-4 = 16. Is the area 320?  </SPAN>\n" );
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