а) 25а^2 - 4 = (5a + 2)(5a - 2)б) 81у^2 - 121 = (9y + 11)(9y - 11)в) х^3 + х^2 - 4х - 4 = (x + 1)(x^2 - 1) = (x + 1)(x + 1)(x - 1) = (x + 1)^2(x - 1)
а) 25а^2 - 4 = (5a + 2)(5a - 2)
б) 81у^2 - 121 = (9y + 11)(9y - 11)
в) х^3 + х^2 - 4х - 4 = (x + 1)(x^2 - 1) = (x + 1)(x + 1)(x - 1) = (x + 1)^2(x - 1)