document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=298101>Question 298101</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Suppose A is a 2*2 matrix where the sum of each of the columns is equal to 0. Prove that A in not invertible. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #214865 by </B><A HREF=/tutors/aboutme.mpl?userid=user_dude2008><B>user_dude2008(1862)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=user_dude2008><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=214865\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> a   b<BR>\n" );
document.write( "-a  -b\r<BR>\n" );
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document.write( "determinant is -ab+ab=0 ----> matrix is not invertible </SPAN>\n" );
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