document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=92075>Question 92075</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/0395977258/algebrahomeworkh>algebra and trigonometry</A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> can someone help me,i dont get this!!! Find the dimensions of a rectangle a with the greatest area whose perimeter is 30 feet. i dont get this!!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #66949 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=66949\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the perimeter (2L+2W) is 30 ... 2(L+W)=30 ... L+W=15 ... L=15-W ... so the area is A=(L)(W) ... A=(15-W)(W) ... A=15W-W^2\r<BR>\n" );
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document.write( "the maximum value for A occurs on the axis of symmetry of the graph\r<BR>\n" );
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document.write( "the equation of the axis of symmetry for ax^2+bx+c is x=-b/2a\r<BR>\n" );
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document.write( "in this case W=-15/2(-1) or W=7.5 ... since L+W=15, L=7.5\r<BR>\n" );
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document.write( "the rectangle of perimeter 30 with the greatest area is a square with side 7.5 </SPAN>\n" );
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