document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=625171>Question 625171</A>: <I><SPAN STYLE=\"word-break: break-all;\"> You are given the coordinates of the vertex   (7,8)  and of a point   (-4,-9)   on a parabola. Find the equation of the parabola </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #393366 by </B><A HREF=/tutors/aboutme.mpl?userid=oscargut><B>oscargut(2103)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=oscargut><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=oscargut><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=393366\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Vertex is (7,8)\r<BR>\n" );
document.write( "\n" );
document.write( "then equation is:\r<BR>\n" );
document.write( "\n" );
document.write( "y = a(x-7)^2+8\r<BR>\n" );
document.write( "\n" );
document.write( "(-4,-9) is in the parabola then:\r<BR>\n" );
document.write( "\n" );
document.write( "-9 = a(-4-7)^2+8\r<BR>\n" );
document.write( "\n" );
document.write( "-9 = 121a+8\r<BR>\n" );
document.write( "\n" );
document.write( "121a = -17\r<BR>\n" );
document.write( "\n" );
document.write( "Answer: y = (-17/121)(x-7)^2+8\r<BR>\n" );
document.write( "\n" );
document.write( "If you have any doubt or if you have  more problems my e-mail is:  \r<BR>\n" );
document.write( "\n" );
document.write( "mthman@gmail.com\r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );