document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=836523>Question 836523</A>: <I><SPAN STYLE=\"word-break: break-all;\"> What are the x-intercepts of -x^4+16x^2 ? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #504237 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=504237\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> What are the x-intercepts of -x^4+16x^2 ?<BR>\n" );
document.write( "equation is:<BR>\n" );
document.write( "y=-x^4+16x^2<BR>\n" );
document.write( ".<BR>\n" );
document.write( "to find x-intercepts, set y=0 and solve for x:<BR>\n" );
document.write( "0=-x^4+16x^2<BR>\n" );
document.write( "0=x^4-16x^2<BR>\n" );
document.write( "0=x^2(x^2-16)<BR>\n" );
document.write( "0=x^2(x^2-4^2)<BR>\n" );
document.write( "0=x^2(x-4)(x+4)<BR>\n" );
document.write( "x = {-4,0,4}<BR>\n" );
document.write( ".<BR>\n" );
document.write( "x-intercepts are at:<BR>\n" );
document.write( "(-4,0), (0,0), and (4,0)<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );