document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=805646>Question 805646</A>: <I><SPAN STYLE=\"word-break: break-all;\"> solve the equation in Radians for all exact solutions where appropriate. Round approximate answer in radians to four decimal place. write answer using the least possible non-negative angle measures.\r<BR>\n" );
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document.write( "     cos x (5 cos x - 1) = 3\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #485396 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=485396\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> solve the equation in Radians for all exact solutions where appropriate. Round approximate answer in radians to four decimal place. write answer using the least possible non-negative angle measures. <BR>\n" );
document.write( "cos x (5 cos x - 1) = 3<BR>\n" );
document.write( "***<BR>\n" );
document.write( "cos x (5 cos x - 1) = 3<BR>\n" );
document.write( "5cos^2(x)-cos(x)=3<BR>\n" );
document.write( "5cos^2(x)-cos(x)-3=0<BR>\n" );
document.write( "solve for cos(x) by quadratic formula:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=cos%28x%29+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ ALIGN=MIDDLE  ALT=\"cos%28x%29+=+%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=5, b=-1, c=-3<BR>\n" );
document.write( "ans:<BR>\n" );
document.write( "cos(x)=-0.6810<BR>\n" );
document.write( "use calculator inverse cos key set to radians<BR>\n" );
document.write( "x=2.3199+2&#960;k, 3.9633,+2&#960;k, k=integer (In quadrants II and III where cos<0)<BR>\n" );
document.write( "or<BR>\n" );
document.write( "cos(x)=0.8810<BR>\n" );
document.write( "use calculator inverse cos key set to radians<BR>\n" );
document.write( "x=0.4928+2&#960;k, 5.7904,+2&#960;k, k=integer (In quadrants I and IV where cos>0)<BR>\n" );
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