Help ASAP!!!! Will mark you brainliest

Answer:
OK so... I know the answer to x(4)+4x(3)+5x(2)-4x-4 = -4
The part i don't understand is the f(x)=k=1 part.
Step-by-step explanation:
So overall the only answer I know is -4 Sry i couldn't help more.
Brainliest?