a² - b² = (a + b) · (a - b) - формула
(6a)² - (-7c)² = (6a - 7c) · (6a + 7c) = 36a² - 42ac + 42ac - 49c² = 36a² - 49c².
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a² - b² = (a + b) · (a - b) - формула
(6a)² - (-7c)² = (6a - 7c) · (6a + 7c) = 36a² - 42ac + 42ac - 49c² = 36a² - 49c².