document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=232501>Question 232501</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have got a question could someone explain to me how to convert this into polar coordinates; <BR>\n" );
document.write( "x^2 + y^2 = 4x<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 #171801 by </B><A HREF=/tutors/aboutme.mpl?userid=rapaljer><B>rapaljer(4671)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rapaljer><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=rapaljer><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=171801\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> x^2+y^2=r^2 \r<BR>\n" );
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document.write( "x=r*cos(theta)<BR>\n" );
document.write( "y=r*sin(theta)\r<BR>\n" );
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document.write( "Substitute these into x^2 + y^2 = 4x<BR>\n" );
document.write( "r^2=r*cos(theta)\r<BR>\n" );
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document.write( "Set equal to zero,<BR>\n" );
document.write( "r^2 -r*cos(theta)=0\r<BR>\n" );
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document.write( "Factor out the r:<BR>\n" );
document.write( "r(r-cos(theta)) =0  There are TWO solutions.\r<BR>\n" );
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document.write( "FIRST SOLUTION:<BR>\n" );
document.write( "r=0 which is just a point (0,0)\r<BR>\n" );
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document.write( "SECOND SOLUTION:<BR>\n" );
document.write( "r-cos(theta) =0\r<BR>\n" );
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document.write( "r=cos(theta)\r<BR>\n" );
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document.write( "Since the second solution includes the point (0,0), this is automatically included in second solution.  The final answer is r=cos(theta).\r<BR>\n" );
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document.write( "Dr. Robert J. Rapalje<BR>\n" );
document.write( "Seminole State College of Florida\r<BR>\n" );
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