For Q 14 (d) since this is a 2U paper, although it's not incorrect, factorising with a power of 5 i've never seen for 2U. What should've been done was using the sum of the geometric series for 1 + x + x^2 + x^3 + x^4 which is equal to (x^5 - 1) / (x - 1). So in this case replace (x^5 - 1) / (x -...