document.write( "Question 1012244: 3.15\r
\n" ); document.write( "\n" ); document.write( "For f(x)=9x and g(x)=x+9, find the following functions:\r
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Algebra.Com's Answer #628152 by ikleyn(52788) $\"\"$ $\"About$

You can put this solution on YOUR website!
.
\n" ); document.write( "For f(x)=9x and g(x)=x+9, find the following functions:\r
\n" ); document.write( "\n" ); document.write( "A. (fog)(x)=
\n" ); document.write( "B. (gof)(x)=
\n" ); document.write( "C. (fog)(3)=
\n" ); document.write( "D. (gof)(3)=
\n" ); document.write( "------------------------------------------------\r
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document.write( "A. (fog)(x) = 9*(x+9) = 9x + 9.\r\n" );
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document.write( "   How it is obtained?\r\n" );
document.write( "   Take f(x) = 9x and then substitute g(x) = x+9 instead of x into f(x).\r\n" );
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document.write( "B. (gof)(x) = 9*(x+9) = 9x + 9.\r\n" );
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document.write( "   How it is obtained?\r\n" );
document.write( "   Take g(x) = x+9 and then substitute f(x) = 9x instead of x into g(x).   \r\n" );
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document.write( "The resulting functions are identical in these cases.\r\n" );
document.write( "This is OK.\r\n" );
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document.write( "C. and D.  <----->  I will not calculate the values for you.\r\n" );
document.write( "                    You can do it yourself.\r\n" );
document.write( "                    Surely, the resulting numbers should be the same for C and D, because \r\n" );
document.write( "                      the resulting functions are the same for A and B.\r\n" );
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document.write( "Good luck!\r\n" );
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