(6-5а) ^2 - 16
(6-5а-4)(6-5а+4)
(2-5а)(10-5а)
(2-5а)*5(2-а)
5(2-5а)(2-а)
(6 - 5a)² - 16 = (6 - 5a)² - 4² = (6 - 5a - 4)(6 - 5a + 4) = (2 - 5a)(10 - 5a) =
= 5(2 - 5a)(2 - a)
(6-5а) ^2 - 16
(6-5а-4)(6-5а+4)
(2-5а)(10-5а)
(2-5а)*5(2-а)
5(2-5а)(2-а)
(6 - 5a)² - 16 = (6 - 5a)² - 4² = (6 - 5a - 4)(6 - 5a + 4) = (2 - 5a)(10 - 5a) =
= 5(2 - 5a)(2 - a)