document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=949668>Question 949668</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The perimeter of a rectangle is 14cm. If the diagonal is 5cm, find the dimensions of the rectangle. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #579801 by </B><A HREF=/tutors/aboutme.mpl?userid=macston><B>macston(5194)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=macston><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/cgi-bin/show-face.mpl?user=macston><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=579801\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The perimeter of a rectangle is 14cm. If the diagonal is 5cm, find the dimensions of the rectangle.<BR>\n" );
document.write( "L=Length; W=width; D=Diagonal; P=perimeter=2(L+W)<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=D=sqrt%28L%5E2%2BW%5E2%29 ALIGN=MIDDLE  ALT=\"D=sqrt%28L%5E2%2BW%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5cm=sqrt%28L%5E2%2BW%5E2%29 ALIGN=MIDDLE  ALT=\"5cm=sqrt%28L%5E2%2BW%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > square each side<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25+sq+cm=%28L%5E2%2BW%5E2%29 ALIGN=MIDDLE  ALT=\"25+sq+cm=%28L%5E2%2BW%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "P=2(L+W)<BR>\n" );
document.write( "14 cm=2(L+W) Divide each side by 2.<BR>\n" );
document.write( "7 cm=L+W Subtract W from each side<BR>\n" );
document.write( "7 cm-W=L<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25+sq+cm=%28L%5E2%2BW%5E2%29 ALIGN=MIDDLE  ALT=\"25+sq+cm=%28L%5E2%2BW%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > Substitute for L<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25+sq+cm=%287cm-W%29%5E2%2BW%5E2%29 ALIGN=MIDDLE  ALT=\"25+sq+cm=%287cm-W%29%5E2%2BW%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=25+sq+cm=W%5E2-14W%2B49%2BW%5E2 ALIGN=MIDDLE  ALT=\"25+sq+cm=W%5E2-14W%2B49%2BW%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > Subtract 25 cm from each side.<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=0=2W%5E2-14W%2B24cm ALIGN=MIDDLE  ALT=\"0=2W%5E2-14W%2B24cm\"   DISABLED_style= \"max-width:90%; height:auto;\" ><TABLE  BORDER=1>\n" );
document.write( "\n" );
document.write( " <TR><TD  ALIGN=MIDDLE>Solved by <A  rel=nofollow HREF=http://wiki.algebra.com/index.php/Tutoring_-_pluggable_solvers>pluggable</A> solver: <A  rel=nofollow HREF=quadratic.solver>SOLVE quadratic equation with variable</A></TD></TR>\n" );
document.write( "<TR><TD  ALIGN=LEFT>Quadratic equation <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=aW%5E2%2BbW%2Bc=0 ALIGN=MIDDLE  ALT=\"aW%5E2%2BbW%2Bc=0\"   DISABLED_style= \"max-width:90%; height:auto;\" > (in our case <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2W%5E2%2B-14W%2B24+=+0 ALIGN=MIDDLE  ALT=\"2W%5E2%2B-14W%2B24+=+0\"   DISABLED_style= \"max-width:90%; height:auto;\" >) has the following solutons:<BR>\n" );
document.write( "  <BR>\n" );
document.write( "  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=W%5B12%5D+=+%28b%2B-sqrt%28+b%5E2-4ac+%29%29%2F2%5Ca ALIGN=MIDDLE  ALT=\"W%5B12%5D+=+%28b%2B-sqrt%28+b%5E2-4ac+%29%29%2F2%5Ca\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "  <BR>\n" );
document.write( "  For these solutions to exist, the <U>discriminant</U> <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b%5E2-4ac ALIGN=MIDDLE  ALT=\"b%5E2-4ac\"   DISABLED_style= \"max-width:90%; height:auto;\" > should not be a negative number.<BR>\n" );
document.write( "  <BR>\n" );
document.write( "  First, we need to compute the discriminant <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b%5E2-4ac ALIGN=MIDDLE  ALT=\"b%5E2-4ac\"   DISABLED_style= \"max-width:90%; height:auto;\" >: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=b%5E2-4ac=%28-14%29%5E2-4%2A2%2A24=4 ALIGN=MIDDLE  ALT=\"b%5E2-4ac=%28-14%29%5E2-4%2A2%2A24=4\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "  <BR>\n" );
document.write( "  Discriminant d=4 is greater than zero. That means that there are two solutions: <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+x%5B12%5D+=+%28--14%2B-sqrt%28+4+%29%29%2F2%5Ca ALIGN=MIDDLE  ALT=\"+x%5B12%5D+=+%28--14%2B-sqrt%28+4+%29%29%2F2%5Ca\"   DISABLED_style= \"max-width:90%; height:auto;\" >.<BR>\n" );
document.write( "  <BR>\n" );
document.write( "    <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=W%5B1%5D+=+%28-%28-14%29%2Bsqrt%28+4+%29%29%2F2%5C2+=+4 ALIGN=MIDDLE  ALT=\"W%5B1%5D+=+%28-%28-14%29%2Bsqrt%28+4+%29%29%2F2%5C2+=+4\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "    <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=W%5B2%5D+=+%28-%28-14%29-sqrt%28+4+%29%29%2F2%5C2+=+3 ALIGN=MIDDLE  ALT=\"W%5B2%5D+=+%28-%28-14%29-sqrt%28+4+%29%29%2F2%5C2+=+3\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "    <BR>\n" );
document.write( "    Quadratic expression <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2W%5E2%2B-14W%2B24 ALIGN=MIDDLE  ALT=\"2W%5E2%2B-14W%2B24\"   DISABLED_style= \"max-width:90%; height:auto;\" > can be factored:<BR>\n" );
document.write( "  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2W%5E2%2B-14W%2B24+=+2%28W-4%29%2A%28W-3%29 ALIGN=MIDDLE  ALT=\"2W%5E2%2B-14W%2B24+=+2%28W-4%29%2A%28W-3%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "  Again, the answer is: 4, 3.\n" );
document.write( "Here's your graph:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=graph%28+500%2C+500%2C+-10%2C+10%2C+-20%2C+20%2C+2%2Ax%5E2%2B-14%2Ax%2B24+%29 ALIGN=MIDDLE  ALT=\"graph%28+500%2C+500%2C+-10%2C+10%2C+-20%2C+20%2C+2%2Ax%5E2%2B-14%2Ax%2B24+%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ></TD></TR>\n" );
document.write( "</TABLE><BR>\n" );
document.write( "\n" );
document.write( "ANSWER The answers are 3 cm and 4 cm, so when width=3 cm, length=4 cm and when width=4 cm, length=3 cm.<BR>\n" );
document.write( "CHECK<BR>\n" );
document.write( "P=2(L+W)<BR>\n" );
document.write( "14 cm=2(4 cm+3 cm)<BR>\n" );
document.write( "14 cm=2(7 cm)<BR>\n" );
document.write( "14 cm=14 cm<BR>\n" );
document.write( "Diagonal=5<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=D=sqrt%28L%5E2%2BW%5E2%29 ALIGN=MIDDLE  ALT=\"D=sqrt%28L%5E2%2BW%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+cm=sqrt%284%5E2%2B3%5E2%29 ALIGN=MIDDLE  ALT=\"5+cm=sqrt%284%5E2%2B3%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+cm=sqrt%2816%2B9%29 ALIGN=MIDDLE  ALT=\"5+cm=sqrt%2816%2B9%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+cm=sqrt%2825+cm%5E2%29 ALIGN=MIDDLE  ALT=\"5+cm=sqrt%2825+cm%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5+cm=5+cm ALIGN=MIDDLE  ALT=\"5+cm=5+cm\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );