Question

I don't even know how to proceed. I tried King's Rule but don't know how to proceed further.

Answer 1

Try writing each polynomial in terms of powers of (x-1):

eg f(x) = a_0 + a_1 (x-1) + a_2 (x-1)^2 + ... a_n (x-1)^n

and seeing what's left when you put it in the expression.