document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=493725>Question 493725</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Really need some help please.\r<BR>\n" );
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document.write( "Given the quadratic function f(x) = x2 – 18x + 81, find a value of x such that f(x) = 16. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #335433 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=335433\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Given the quadratic function f(x) = x2 – 18x + 81, find a value of x such that f(x) = 16<BR>\n" );
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document.write( "substitute in the value of f(x):<BR>\n" );
document.write( "f(x) = x^2 – 18x + 81<BR>\n" );
document.write( "16 = x^2 – 18x + 81<BR>\n" );
document.write( "0 = x^2 – 18x + 65<BR>\n" );
document.write( "factoring:<BR>\n" );
document.write( "0 = (x-5)(x-13)<BR>\n" );
document.write( "x = {5, 13}  (two possible solutions)<BR>\n" );
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