document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=616069>Question 616069</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how do you work 10r^2+20r-73=7 with completing the square? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #387474 by </B><A HREF=/tutors/aboutme.mpl?userid=nerdybill><B>nerdybill(7384)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=nerdybill><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=nerdybill><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=387474\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> how do you work 10r^2+20r-73=7 with completing the square?<BR>\n" );
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document.write( "10r^2+20r-73=7<BR>\n" );
document.write( "add 73 to both sides:<BR>\n" );
document.write( "10r^2+20r=80<BR>\n" );
document.write( "divide both sides by 10:<BR>\n" );
document.write( "r^2+2r = 8<BR>\n" );
document.write( "add 1/2 'b', square it and add to both sides:<BR>\n" );
document.write( "r^2+2r+1 = 8+1<BR>\n" );
document.write( "(r+1)^2 = 9<BR>\n" );
document.write( "take the square root of both sides:<BR>\n" );
document.write( "r+1 = +- 3<BR>\n" );
document.write( "r = -1 +- 3<BR>\n" );
document.write( "r = {-4, 2}<BR>\n" );
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