In each of the following, a polynomial P(x) and a divisor d(x) are given. Use long division to find the quotient Q(x) and the remainder R(x) when P(x) is divided by d(x). Express P(x) in the form d(x) ( Q(x) + R(x).
a. P(x) = 6x3 - 2x2 + 4x - 1,
d(x) = x - 3
b. P(x) = x4 - 2x3 + x + 5,
d(x) = x + 1