document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=622980>Question 622980</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Find the value of (g • f)(7) if f(x)=3x-4 and g(x)=3x+1... </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #391770 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=391770\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> Find the value of (g • f)(7) if f(x)=3x-4 and g(x)=3x+1<BR>\n" );
document.write( ".<BR>\n" );
document.write( "(g • f)(x) = (3x-4)(3x+1)<BR>\n" );
document.write( "FOIL the right side:<BR>\n" );
document.write( "(g • f)(x) = 9x^2+3x-12x-4<BR>\n" );
document.write( "(g • f)(x) = 9x^2-9x-4<BR>\n" );
document.write( ".<BR>\n" );
document.write( "finally:<BR>\n" );
document.write( "(g • f)(7) = 9(7)^2-9(7)-4<BR>\n" );
document.write( "(g • f)(7) = 9(49)-63-4<BR>\n" );
document.write( "(g • f)(7) = 441-63-4<BR>\n" );
document.write( "(g • f)(7) = 378-4<BR>\n" );
document.write( "(g • f)(7) = 374\r<BR>\n" );
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