document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=383508>Question 383508</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I am stuck on this question.  The formula f(x)=2x^2+22x+320 models the number of inmates(in thousands) in US State and federal prisons x years after 1980.<BR>\n" );
document.write( "A) In which year were there 740 thousand inmates in US state and federal prisons?  I started with adding 740 to the 320 and then broke it down and if I am right i got 2(x^2+11+530).  But not sure where to go from here.\r<BR>\n" );
document.write( "\n" );
document.write( "B) In which year where there 1100 thousand inmates in US state and federal prisons?<BR>\n" );
document.write( "This is in review for my finals.  Any help is great<BR>\n" );
document.write( "Thank you </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #271559 by </B><A HREF=/tutors/aboutme.mpl?userid=richard1234><B>richard1234(7193)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=richard1234><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=richard1234><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=271559\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> For both parts you need to plug in 740 and 1,100 into f(x) to obtain an equation such as\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=740+=+2x%5E2+%2B+22x+%2B+320 ALIGN=MIDDLE  ALT=\"740+=+2x%5E2+%2B+22x+%2B+320\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "\n" );
document.write( "which can be solved by the quadratic formula. </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );