(6m - 7)² - 100 = (6m - 7)² - 10² = (6m - 7 - 10)(6m - 7 + 10) =
= (6m - 17)(6m + 3) = 3(6m - 17)(2m + 1)
(6m - 7)² - 100 = (6m - 7)² - 10² = (6m - 7 - 10)(6m - 7 + 10) =
= (6m - 17)(6m + 3) = 3(6m - 17)(2m + 1)