2 3a 5 6 1 2a 4 July 8, 2019 16 32 64 128 (2a + 3)(5a − 1) − (a − 1)(6a + 5) 9.21. 1) 2a ^ 3 + 5a ^ 2 + 2a 3) - 6a ^ 3 + 13a ^ 2 - 6a
