document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=626022>Question 626022</A>: <I><SPAN STYLE=\"word-break: break-all;\"> a rectangular picture 12cm by 10cm has a white border of uniform width. if the area of the border is 168sq.cm, how wide is the border?\r<BR>\n" );
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document.write( "one hundred tiles of a certain size are needed to pave a floor. if a tile, which measures 4cm less on each side, will be used, 225 tiles will be needed. find the sizr of the larger tile. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #393938 by </B><A HREF=/tutors/aboutme.mpl?userid=Emsley><B>Emsley(35)</B></A><img src=\"/images/stars/stars-07.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Emsley><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=393938\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Let width of border=x So area of picture +border=120+168=288<BR>\n" );
document.write( "But length=12+2x and width=10+2x<BR>\n" );
document.write( "So (12+2x)*(10+2x)=288<BR>\n" );
document.write( "120+44x+4x^2=288<BR>\n" );
document.write( "4x^2+44x-168=0<BR>\n" );
document.write( "x^2+11x-42=0<BR>\n" );
document.write( "(x+14)(x-3)=0  x=3  (cant be -14 </SPAN>\n" );
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