document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=200825>Question 200825</A>: <I><SPAN STYLE=\"word-break: break-all;\"> b^4 + 13b^2 + 36 = 0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #151058 by </B><A HREF=/tutors/aboutme.mpl?userid=RAY100><B>RAY100(1637)</B></A><img src=\"/images/stars/stars-12.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=RAY100><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=151058\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> b^4 +13b^2 +36 =0<BR>\n" );
document.write( "let  a = b^2<BR>\n" );
document.write( "a^2 +13a +36 =0<BR>\n" );
document.write( "(a+9)(a+4) =0<BR>\n" );
document.write( "subst  back<BR>\n" );
document.write( "(b^2 +9)(b^2 +4) =0<BR>\n" );
document.write( ".<BR>\n" );
document.write( "b^2 +9 =0,,,,,   b^2 = -9,,,b=  +/-  3i<BR>\n" );
document.write( ".<BR>\n" );
document.write( "b^2 +4 = 0,,,,,,b^2 = -4,,,,,,,,,b= +/-  2i  </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );