document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=2893>Question 2893</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I need your help please...........\r<BR>\n" );
document.write( "\n" );
document.write( "1. If the matrices A and B are the same size and A+B=A, then:\r<BR>\n" );
document.write( "\n" );
document.write( "a. Each element of B is 1.<BR>\n" );
document.write( "b. Each element of B is 0.<BR>\n" );
document.write( "c. A-B=A.<BR>\n" );
document.write( "d. B=I, the identity matrix.<BR>\n" );
document.write( "e. B and C\r<BR>\n" );
document.write( "\n" );
document.write( "2. For the matrices C and D below, find the value of the missing element in D that makes the matrix product CD=[10].\r<BR>\n" );
document.write( "\n" );
document.write( "C=[10 15 -2 5] D=[2 -3 5]...\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #1265 by </B><A HREF=/tutors/aboutme.mpl?userid=khwang><B>khwang(438)</B></A><img src=\"/images/stars/stars-10.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=khwang><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=1265\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 1. Like regular numbers A+B =A implies B = 0 (zero matrix)\r<BR>\n" );
document.write( "\n" );
document.write( "2. Not quuite clear tome. C=[10 15 -2 5] <BR>\n" );
document.write( "  let D=[2 -3 5 x]...<BR>\n" );
document.write( " Your CD may mean the dot product or CD^t(transpose) <BR>\n" );
document.write( " = 10*2 + 15*(-3)+ (-2)* 5 + 5 x = 10<BR>\n" );
document.write( " = -35 + 5x =10, so x = 9.<BR>\n" );
document.write( "   <BR>\n" );
document.write( "  <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );