document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=963709>Question 963709</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help! Do not understand!!<BR>\n" );
document.write( "Find the solutions of the given equation in the indicated interval. (Give your answers to two decimal places. Enter your answers as a comma-separated list.)<BR>\n" );
document.write( "20 (cos(x))^2 + cos(x) &#8722; 1 = 0,      [0, &#960;]<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 #588772 by </B><A HREF=/tutors/aboutme.mpl?userid=lwsshak3><B>lwsshak3(11628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=lwsshak3><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=588772\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the solutions of the given equation in the indicated interval. (Give your answers to two decimal places. Enter your answers as a comma-separated list.)<BR>\n" );
document.write( "20 (cos(x))^2 + cos(x) &#8722; 1 = 0, [0, &#960;]<BR>\n" );
document.write( "***<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=20cos%5E2%28x%29%2Bcosx-1=0 ALIGN=MIDDLE  ALT=\"20cos%5E2%28x%29%2Bcosx-1=0\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "solve for cosx by quadratic formula<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cosx+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"cosx+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "a=20, b=1, c=-1<BR>\n" );
document.write( "ans:<BR>\n" );
document.write( "cosx=-0.25<BR>\n" );
document.write( "x=1.82 radians<BR>\n" );
document.write( "or <BR>\n" );
document.write( "cosx=0.2<BR>\n" );
document.write( "x=1.37 radians </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );