document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=960756>Question 960756</A>: <I><SPAN STYLE=\"word-break: break-all;\"> When factored completely, how is 7x^2-21xy-28y^2 written? I need help with this problem because I  know how to solve it by looking at it but I need to show work. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #587130 by </B><A HREF=/tutors/aboutme.mpl?userid=rothauserc><B>rothauserc(4718)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rothauserc><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=rothauserc><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=587130\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 7x^2 -21xy -28y^2<BR>\n" );
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document.write( "the coefficient of x^2 is 7 which is a prime number, therefore we have<BR>\n" );
document.write( "(7x +or- ?) * (x +or- ?)<BR>\n" );
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document.write( "now we factor 28 (coefficient of y^2)<BR>\n" );
document.write( "1 * 28<BR>\n" );
document.write( "2 * 14 <BR>\n" );
document.write( "4 * 7<BR>\n" );
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document.write( "we want a -21 (coefficient of xy), therefore<BR>\n" );
document.write( "(7x + 7) * (x - 4) gives us the desired results<BR>\n" );
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