1980 AHSME Problems/Problem 14
Revision as of 18:08, 9 February 2013 by Oaktree1998 (talk | contribs) (Created page with "As <math>f(x)=cx/2x+3</math>, we can plug that into <math>f(f(x))</math> and simplify to get <math>c^2x/2cx+6x+9 = x</math> . However, we have a restriction on x such that if <ma...")
As 
, we can plug that into 
and simplify to get 
. However, we have a restriction on x such that if 
we have an undefined function. We can use this to our advantage. Plugging that value for x into the simplified function yields 
, as the left hand side simplifies and the right hand side is simply the value we have chosen. This means that 
, which is answer choice A.
