Question

please answer it guys​

Answer 1

25a^2 - 4b^2 + 28bc - 49c^2

=> (5a)² - [4b² - 28bc + 49c²]

=> (5a)² - [(2b)² - 2 * 2b * 7c + (7c)²]

=>  (5a)² - (2b - 7c)²

∴ a² - b² = (a + b)(a - b)

=> (5a + 2b - 7c)(5a - 2b + 7c)

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