Intermediate value theorem (IVT), calculus homework help

Intermediate value theorem (IVT), calculus homework help

Could someone help me solve this problem, using the IVT?

   − 2x  − 2  
Given f(x) =  —————      
   − 4x  − 4  


Find the value of c (to two decimal places) in [3,12] where f(c) = 0.5.