document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=320386>Question 320386</A>: <I><SPAN STYLE=\"word-break: break-all;\"> In which direction does the parabola for the quadratic equation y = -5x2 – 16x + 21 open? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #229441 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=229441\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">     In which direction does the parabola for the quadratic equation y = -5x2 – 16x + 21 open?<BR>\n" );
document.write( ".<BR>\n" );
document.write( "To determine, always look at the \"coefficient\" associated with the <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=x%5E2 ALIGN=MIDDLE  ALT=\"x%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > term.  <BR>\n" );
document.write( "If it is POSITIVE (happy face:U), it opens upwards.<BR>\n" );
document.write( "If it is NEGATIVE (sad face:n), it opens downwards.<BR>\n" );
document.write( ".<BR>\n" );
document.write( "In your case, you're looking at:<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=5x%5E2 ALIGN=MIDDLE  ALT=\"5x%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "The coefficient is 5 which is POSITIVE.<BR>\n" );
document.write( "So the parabola opens upwards. </SPAN>\n" );
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