factorize :9(a-2b)2-16(2a-3b)2

9 {(a - 2 b)}^{2} - 16 {(2 a - 3 b)}^{2} = {(3 (a - 2 b))}^{2} - {(4 (2 a - 3 b))}^{2} = {(3 a - 6 b)}^{2} - {(8 a - 12 b)}^{2} = [3 a - 6 b - 8 a + 12 b] [3 a - 6 b + 8 a - 12 b] = (- 5 a + 6 b) (11 a - 18 b)