"An Exponential Function"

Given the following function:

f(x) = 4^x + x^3 + x^2 + x - 2^x
3^x

What is the first 3 digits of the value of f(50)?


Once you understand the equation it's fairly trivial to write a script for this... remember to read the question carefully especially abdout the awnser it wants!

Awnser:

Source: