document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=189188>Question 189188</A>: <I><SPAN STYLE=\"word-break: break-all;\"> i have to find which interval must contain a zero of f with the intermediate value theorem. if i have x^4-x^2-15 how do i get a= and b= and how do i solve that? it s badly described in the book... <BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #141929 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=141929\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> i have to find which interval must contain a zero of f with the intermediate value theorem. if i have x^4-x^2-15 how do i get a= and b= and how do i solve that? it s badly described in the book... \r<BR>\n" );
document.write( "\n" );
document.write( "-------------<BR>\n" );
document.write( "The idea is common sense.  If the function is negative and then becomes<BR>\n" );
document.write( "positive it must pass thru zero.<BR>\n" );
document.write( "-------------<BR>\n" );
document.write( "So, if f(0) = 0 - 9 - 15 = -15<BR>\n" );
document.write( "and f(3) = 3^4 - 3^2 - 15 = 81 -24 = 57,<BR>\n" );
document.write( "There must be a zero between x = 0 and x = 3<BR>\n" );
document.write( "=================================================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );