document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1141439>Question 1141439</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Let →a=⟨2,6,−3⟩ and →b=⟨8,6,1⟩.\r<BR>\n" );
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document.write( "Find (→a−→b)×(→a+→b) </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #761979 by </B><A HREF=/tutors/aboutme.mpl?userid=math_helper><B>math_helper(2461)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=math_helper><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=math_helper><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=761979\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> (→a - →b) = <2-8, 6-6, -3-1>  = <-6, 0, -4><br>\r<BR>\n" );
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document.write( "(→a + →b) = <2+8, 6+6, -3+1>  = <10, 12, -2><br>\r<BR>\n" );
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document.write( "(→a - →b) x (→a + →b) =  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+matrix%283%2C3%2Ci%2Cj%2Ck%2C+-6%2C0%2C4%2C+10%2C12%2C-2%29+%29+ ALIGN=MIDDLE  ALT=\"+%28+matrix%283%2C3%2Ci%2Cj%2Ck%2C+-6%2C0%2C4%2C+10%2C12%2C-2%29+%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><br><BR>\n" );
document.write( "=   <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28matrix%282%2C2%2C+0%2C+4%2C12%2C-2%29%29i+-+%28matrix%282%2C2%2C+-6%2C4%2C10%2C-2%29%29j+%2B+%28matrix%282%2C2%2C-6%2C0%2C10%2C12%29%29k+ ALIGN=MIDDLE   DISABLED_style= \"max-width:90%; height:auto;\" >  <BR>\n" );
document.write( "=  <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+-48i+%2B+28j+-+72k+ ALIGN=MIDDLE  ALT=\"+-48i+%2B+28j+-+72k+\"   DISABLED_style= \"max-width:90%; height:auto;\" >  <br><BR>\n" );
document.write( "=   < -48, 28, -72 > </SPAN>\n" );
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