document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=823661>Question 823661</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Please help me with this : f(x)=8x^2+6 and g(x)=6x+a, find a so that the graph of f of g crosses the y-axis at 78 </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #495678 by </B><A HREF=/tutors/aboutme.mpl?userid=stanbon><B>stanbon(75887)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=stanbon><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=495678\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\">  Please help me with this : f(x)=8x^2+6 and g(x)=6x+a, find a so that the graph of f of g crosses the y-axis at 78<BR>\n" );
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document.write( "fog(x) = f[g(x)] = f[6x+a] = 8(6x+a)^2+6 <BR>\n" );
document.write( "= 8(36x^2+12ax+a^2)+6<BR>\n" );
document.write( "= 288x^2 + 96ax + 8a^2+6<BR>\n" );
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document.write( "Solve for \"a\" based using (0,78)<BR>\n" );
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document.write( "78 = 0 + 0 + 8a^2+6<BR>\n" );
document.write( "8a^2 = 72<BR>\n" );
document.write( "a^2 = 9<BR>\n" );
document.write( "a = 3 or a = -3<BR>\n" );
document.write( "====================<BR>\n" );
document.write( "Cheers,<BR>\n" );
document.write( "Stan H.<BR>\n" );
document.write( "==================== </SPAN>\n" );
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