document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=980627>Question 980627</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve in complex number system. x^2-4x+9=0. x to the 2nd power minus 4x plus 9 equals 0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #601755 by </B><A HREF=/tutors/aboutme.mpl?userid=Boreal><B>Boreal(15235)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Boreal><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=Boreal><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=601755\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> quadratic formula<BR>\n" );
document.write( "(1/2a){-b +/- sqrt (b^2-4ac)}<BR>\n" );
document.write( "(1/2) {4 +/- sqrt (16-36)}   sqrt (-20)= 2i sqrt (5), because it is sqrt (-4)*sqrt (5)\r<BR>\n" );
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document.write( "x=(1/2){ 4+/- 2i  sqrt (5)}<BR>\n" );
document.write( "x=2 +/- i  sqrt (5)\r<BR>\n" );
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