Suppose a sequence satisfies the given recurrence relation and initial conditions. Find an explicit formula for the sequence. 1. ap = 7ak-1 - 10ax-2, for every integer k > 2 00 = -2, 01 = 2 2. be = be-1 + 6bk-2, for every integer k > 2 bo = 0, b1 = 3 3. ak = 6ak-1 - 9ak-2, for every integer k > 2 an = 1, 01 = 3 4. be = 2bk-1 - bk-2, for every integer k > 2 bo = 1, b] = 4