Given equation is 
Now it says to find f(2)
that simply means plug x=2 because we see that 2 is written in place of x in f(x) and f(2)



Hence final answer is 
Answer:
I think it is zero
Step-by-step explanation:
Incorect, you messed up on the second step. 7x4x is not 7x, it is 28x.