document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=535558>Question 535558</A>: <I><SPAN STYLE=\"word-break: break-all;\"> If f(x) = 2x + 4, and g(x) = (x^2 + x +5), find g (f(x)).\r<BR>\n" );
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document.write( "I have solved to <BR>\n" );
document.write( "g(f(x)) = ((2x + 4)^2 + (2x + 4) + 5)<BR>\n" );
document.write( "4x^2 + 8x + 8x + 16 + 2x + 4 + 5<BR>\n" );
document.write( "4x^2 + 18x + 25\r<BR>\n" );
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document.write( "Then I am stuck. I am wondering if I did some arithmetic error that I am not seeing or if I just cannot find the right factor.  </SPAN>\n" );
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document.write( "That's the answer unless you're trying to find the roots.<P>\r<BR>\n" );
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document.write( "4x^2 + 18x +25 = 0  Cannot factor, so use the quadratic formula to find the solutions.<P>\r<BR>\n" );
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document.write( "a = 4, b=18, c = 25   (-b + or - sqrt (b^2-4ac))/2a = <P>\r<BR>\n" );
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document.write( "(-18 + or - sqrt (324-4*4*25))/8 = (-18 + or - sqrt (-76))/8=<P>\r<BR>\n" );
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document.write( "(-18 + or - sqrt(-1)*sqrt(4)*sqrt(19))/4 = <P>\r<BR>\n" );
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document.write( "(-18 + or - 2isqrt(19))/4 = <P>\r<BR>\n" );
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document.write( "(-9/4) + (1/2)i*sqrt(19) or (-9/4) - (1/2)i*sqrt(19) </SPAN>\n" );
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