Which expression value is equivalent to (a^8)^4 a. a^4 b. a^2 c. a^12 d. a^32

I'm terrible at math any here is appreciated.

What is the difference between the predicted value and the actual value

Find the value of p for which the polynomial 3x^3 -x^2 + px +1 is exactly divisible by x-1, hence factorise the polynomial