document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=48559>Question 48559</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the problem, if possible.  Round your answer to the nearest tenth, when appropriate.\r<BR>\n" );
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document.write( "A book has pages that are 16 cm by 20 cm.  The printed matter on a page of the book must cover <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=140cm%5E2 ALIGN=MIDDLE  ALT=\"140cm%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  If all margins are to be the same width, how wide should the margins be?   </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #32150 by </B><A HREF=/tutors/aboutme.mpl?userid=Earlsdon><B>Earlsdon(6294)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Earlsdon><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=32150\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let the width of the margin be x cm.<BR>\n" );
document.write( "The area of the printed matter can be represented by the length of the page less twice the margin (20-2x) times the width of the page less twice the margin (16-2x), and this is given as 140 sq.cm.  You can write the appropriate equation for this:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%2820-2x%29%2816-2x%29+=+140 ALIGN=MIDDLE  ALT=\"%2820-2x%29%2816-2x%29+=+140\"   DISABLED_style= \"max-width:90%; height:auto;\" > Perform the indicated multiplication and simplify.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=320-72x%2B4x%5E2+=+140 ALIGN=MIDDLE  ALT=\"320-72x%2B4x%5E2+=+140\"   DISABLED_style= \"max-width:90%; height:auto;\" > Rewrite as:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4x%5E2-72x%2B320+=+140 ALIGN=MIDDLE  ALT=\"4x%5E2-72x%2B320+=+140\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 140 from both sides of the equation.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4x%5E2-72x%2B180+=+0 ALIGN=MIDDLE  ALT=\"4x%5E2-72x%2B180+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > Factor out a 4 to simplify.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%28x%5E2-18x%2B45%29+=+0 ALIGN=MIDDLE  ALT=\"4%28x%5E2-18x%2B45%29+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > Apply the zero product principle.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2-18x%2B45+=+0 ALIGN=MIDDLE  ALT=\"x%5E2-18x%2B45+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > Solve by factoring.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=%28x-3%29%28x-15%29+=+0 ALIGN=MIDDLE  ALT=\"%28x-3%29%28x-15%29+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > Apply the zero product principle.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x-3+=+0 ALIGN=MIDDLE  ALT=\"x-3+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > and/or <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x-15+=+0 ALIGN=MIDDLE  ALT=\"x-15+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "If <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x-3+=+0 ALIGN=MIDDLE  ALT=\"x-3+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+3 ALIGN=MIDDLE  ALT=\"x+=+3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "If <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x-15+=+0 ALIGN=MIDDLE  ALT=\"x-15+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" > then <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x+=+15 ALIGN=MIDDLE  ALT=\"x+=+15\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
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document.write( "The margin is either 3 cm wide or 15 cm wide.<BR>\n" );
document.write( "But if the margin were 15 cm wide, there would be no space for the printed matter because the page is only 16 cm wide and the margin of 15 cm on both sides of the page just doesn't make any practical sense...so discard the 15 cm solution.\r<BR>\n" );
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document.write( "The margin has to be 3 cm wide. </SPAN>\n" );
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