document.write( "Question 183673: Given f(x) = 2x + 9, find ( f^-1 o f)(x) \n" ); document.write( "
Algebra.Com's Answer #137878 by HyperBrain(694)\"\" \"About 
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f(x) = 2x + 9
\n" ); document.write( "Step 1: for convenience, let's replace f(x) with y
\n" ); document.write( "y=2x+9
\n" ); document.write( "Step 2: replace all y's with x and replace all x's with y
\n" ); document.write( "x=2y+9
\n" ); document.write( "Step 3: express x in terms of y
\n" ); document.write( "...
\n" ); document.write( "x=2y+9
\n" ); document.write( "2y+9=x
\n" ); document.write( "2y=x-9
\n" ); document.write( "y=(x-9)/2\r
\n" ); document.write( "\n" ); document.write( "Step 4: replace y with f-1(x)\r
\n" ); document.write( "\n" ); document.write( "f-1(x)=(x-9)/2\r
\n" ); document.write( "\n" ); document.write( "Power up,
\n" ); document.write( "HyperBrain!\r
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