document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1005797>Question 1005797</A>: <I><SPAN STYLE=\"word-break: break-all;\"> let A =<BR>\n" );
document.write( "[3 -8 -5]<BR>\n" );
document.write( "[-4 -1 5]<BR>\n" );
document.write( "[-1 -9 -2]\r<BR>\n" );
document.write( "\n" );
document.write( "and B =<BR>\n" );
document.write( "[-4 -7 -1]<BR>\n" );
document.write( "[8 -1 8]<BR>\n" );
document.write( "[-3 -3 7]\r<BR>\n" );
document.write( "\n" );
document.write( " Find 2A - 4B. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #621966 by </B><A HREF=/tutors/aboutme.mpl?userid=ikleyn><B>ikleyn(52788)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=ikleyn><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=ikleyn><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=621966\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> .<BR>\n" );
document.write( "Do it for each matrix element: calculate &nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2AA%5Bi%2Cj%5D ALIGN=MIDDLE  ALT=\"2%2AA%5Bi%2Cj%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > - <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2AB%5Bi%2Cj%5D ALIGN=MIDDLE  ALT=\"4%2AB%5Bi%2Cj%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > &nbsp;for each pair of indexes &nbsp;[i,j], i = 1 ,2 3; &nbsp;j = 1, 2, 3.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Here &nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%5Bi%2Cj%5D ALIGN=MIDDLE  ALT=\"A%5Bi%2Cj%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > &nbsp;is the element of the matrix &nbsp;A &nbsp;at the intersection of the &nbsp;i-th horizontal row and &nbsp;j-th vertical column. \r<BR>\n" );
document.write( "\n" );
document.write( "Similar for &nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B%5Bi%2Cj%5D ALIGN=MIDDLE  ALT=\"B%5Bi%2Cj%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "For instance, &nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A%5B1%2C2%5D ALIGN=MIDDLE  ALT=\"A%5B1%2C2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -8, &nbsp;&nbsp;<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=B%5B1%2C2%5D ALIGN=MIDDLE  ALT=\"B%5B1%2C2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = -7, &nbsp;&nbsp;and \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=2%2AA%5B1%2C2%5D ALIGN=MIDDLE  ALT=\"2%2AA%5B1%2C2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > - <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=4%2AB%5B1%2C2%5D ALIGN=MIDDLE  ALT=\"4%2AB%5B1%2C2%5D\"   DISABLED_style= \"max-width:90%; height:auto;\" > = 2*(-8) - 4*(-7) = -16 + 28 = 12.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );