Question

factorise
(6a-5b)^2-9(a-2b)^2

Answer 1

${(6a - 5b)}^{2} - {3}^{2} {(a - 2b)}^{2} \\ = {(6a - 5b)}^{2} - {(3a - 6b)}^{2} \\ = (6a - 5b + 3a - 6b)(6a - 5b - 3a + 6b) \\ = (9a - 11b)(3a +b)$

Answer 2

Here is the answer ...here the identities used r shown in black