document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=730867>Question 730867</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Solve the following inequality. Write yur solution in interval notation.<BR>\n" );
document.write( "                    x^3+81x>0 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #446886 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=446886\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Solve the following inequality. Write your solution in interval notation.<BR>\n" );
document.write( "x^3+81x>0<BR>\n" );
document.write( "------<BR>\n" );
document.write( "Factor:<BR>\n" );
document.write( "x(x+9)(x-9) > 0<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Draw a number line; plot x = -9, x = 0, x = 9<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Test a value in each number line interval.<BR>\n" );
document.write( "Test x = -10 to get: -*-*- > 0;   false<BR>\n" );
document.write( "Test x = -5 to get:: -*+*- > 0:   true<BR>\n" );
document.write( "Test x = 5 to get::: +*+*- > 0:   false<BR>\n" );
document.write( "Test x = 10 to get:: +*+*+ > 0:   true<BR>\n" );
document.write( "----<BR>\n" );
document.write( "Solution: (-9,0)U(9,+oo)<BR>\n" );
document.write( "===============================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );