document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=143174>Question 143174</A>This question is from textbook <A HREF=http://www.amazon.com/exec/obidos/ASIN/9781567655858/algebrahomeworkh></A><BR>\n" );
document.write( ": <I><SPAN STYLE=\"word-break: break-all;\"> the area of a rectangular parcel of land is 720 sq. meters. the length of the land is 4 meters less than twice the width.<BR>\n" );
document.write( "a. write an equation than can be used to find the dimensions of the land.<BR>\n" );
document.write( "(i think i have this-  720=(2w-4)w)<BR>\n" );
document.write( "b.solve the equation in part a. to find the dimensions of the land<BR>\n" );
document.write( "Note: i already have the answer(l=36,w=20), i just don't know how to solve the equation)  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #104156 by </B><A HREF=/tutors/aboutme.mpl?userid=rapaljer><B>rapaljer(4671)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rapaljer><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=rapaljer><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=104156\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Multiply out the parentheses.  Since it's quadratic, you have to set it equal to zero:\r<BR>\n" );
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document.write( "720=(2w-4)w<BR>\n" );
document.write( "720=2w^2 - 4w<BR>\n" );
document.write( "0=2w^2 -4w -720\r<BR>\n" );
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document.write( "Factor completely, beginning with the common factor of 2:<BR>\n" );
document.write( "0=2(w^2 -2w-360)\r<BR>\n" );
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document.write( "Factor the trinomial:<BR>\n" );
document.write( "0=2(w+18)(w-20)\r<BR>\n" );
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document.write( "w=-18 or w=20\r<BR>\n" );
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document.write( "Reject the negative answer since a width cannot be negative.<BR>\n" );
document.write( "So, w=20 meters<BR>\n" );
document.write( "2w-4=2(20)-4=40-4=36 meters\r<BR>\n" );
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document.write( "Check:  <BR>\n" );
document.write( "Area = W*L<BR>\n" );
document.write( "Area = 20*36=720 square meters\r<BR>\n" );
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document.write( "R^2 </SPAN>\n" );
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