document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=93105>Question 93105</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Choose the one alternative that best completes the statement or answers the question. \r<BR>\n" );
document.write( "\n" );
document.write( "Solve by completing the square. <BR>\n" );
document.write( "x^2 - 6x - 40 = 0 \r<BR>\n" );
document.write( "\n" );
document.write( "a) 10, -4     b) -10, 4     c)(-36, -4     d) square root of -40, negative square root of -40 \r<BR>\n" );
document.write( "\n" );
document.write( "I think the answer is d after I plugged in all the options, but I don't know how to prove it. When I try to use completing the square I get up to this point, 6 plus or minus the square root of 160 over 2 and I can't go any further. Thanks so much!! </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #67746 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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=67746\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve by completing the square. <BR>\n" );
document.write( "x^2 - 6x - 40 = 0 <BR>\n" );
document.write( "x^2-6x+? = 40+?<BR>\n" );
document.write( "x^2+6x+[(1/2)6]^2 = 40 + [(1/2)6]^2<BR>\n" );
document.write( "x^2+6x+9 = 40+9<BR>\n" );
document.write( "(x+3)^2 = 49<BR>\n" );
document.write( "x+3 = 7 or x+3 = -7<BR>\n" );
document.write( "x = 4 or x = -10<BR>\n" );
document.write( "================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );