document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=138740>Question 138740</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve by using the quadratic formula.  I can not reach the correct answer for:<BR>\n" );
document.write( "3x2-10x-21=0\r<BR>\n" );
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document.write( "I did:  -(-10)+-(-10)2 -4(3)(-21) divided by 2(3) =<BR>\n" );
document.write( "10=-100+252 divided by 6<BR>\n" );
document.write( "10+-352 divided by 6<BR>\n" );
document.write( "10+-18.8 divided by 6\r<BR>\n" );
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document.write( "correct answer:  5+-2(rad)22 over 3.  Please show me what I am doing wrong.  Thank you for your attention.<BR>\n" );
document.write( "Kathy </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #101236 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=101236\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The formula is x = [-b +- sqrt(b^2 - 4ac)]/2a<BR>\n" );
document.write( "You forgot sqrt.<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );