document.write( "Question 81404: If F(x) = 3x^2 - 5x and G(x) = 2x - 4, find G of F(2) and F of G(2)\r
\n" ); document.write( "\n" ); document.write( "I'm having trouble with this problem. Any help is appreciated. Thanks.
\n" ); document.write( "

Algebra.Com's Answer #58315 by SMM52091(3)\"\" \"About 
You can put this solution on YOUR website!
In order to find g(f(2)), just find f(2) and then g() it. For example...\r
\n" ); document.write( "\n" ); document.write( "\"f%28x%29+=+3x%5E2+-+5x\"
\n" ); document.write( "\"f%282%29+=+3%282%5E2%29+-+5%282%29\"
\n" ); document.write( "\"f%282%29+=+3%284%29+-+10\"
\n" ); document.write( "\"f%282%29+=+12+-+10\"
\n" ); document.write( "\"f%282%29+=+2\" Please note that f(2) equaling 2 is just a coincidence.\r
\n" ); document.write( "\n" ); document.write( "So the question asks for g(f(2)). Since f(2) equals 2, then g(f(2)) is the same thing as g(2). Now apply the g formula.\r
\n" ); document.write( "\n" ); document.write( "\"g%28x%29+=+2x+-+4\"
\n" ); document.write( "\"g%282%29+=+2%282%29+-+4\"
\n" ); document.write( "\"g%282%29+=+4+-+4\"
\n" ); document.write( "\"g%282%29+=+0\"\r
\n" ); document.write( "\n" ); document.write( "So g(f(2)) = 0. \r
\n" ); document.write( "\n" ); document.write( "Now just because g(f(2)) equals 0 doesnt mean f(g(2)) equals 0. You need to redo it for the second problem, just in a different way. Find g(2) and then f() it.\r
\n" ); document.write( "\n" ); document.write( "\"g%28x%29+=+2x+-+4\"
\n" ); document.write( "\"g%282%29+=+2%282%29+-+4\"
\n" ); document.write( "\"g%282%29+=+4+-+4\"
\n" ); document.write( "\"g%282%29+=+0\"\r
\n" ); document.write( "\n" ); document.write( "Since g(2) = 0, then f(g(2)) is the same thing as f(0). So find the function of 0 with the f(x) formula.\r
\n" ); document.write( "\n" ); document.write( "\"f%28x%29+=+3x%5E2+-+5x\"
\n" ); document.write( "\"f%280%29+=+3%280%5E2%29-+5%280%29\"
\n" ); document.write( "\"f%280%29+=+3%280%29+-+0\"
\n" ); document.write( "\"f%280%29+=+0+-+0\"
\n" ); document.write( "\"f%280%29+=+0\"\r
\n" ); document.write( "\n" ); document.write( "So f(g(2)) = 0
\n" ); document.write( "Hope I could help
\n" ); document.write( "
\n" );