a² - 25b² + 4a - 20b = (a² - 25b²) + (4a - 20b) = (a - 5b)(a + 5b) + 4(a - 5b) =
= (a - 5b)(a + 5b + 4)
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a² - 25b² + 4a - 20b = (a² - 25b²) + (4a - 20b) = (a - 5b)(a + 5b) + 4(a - 5b) =
= (a - 5b)(a + 5b + 4)