а) 5x^2 - 20 = 5(x^2 - 4) = 5(x + 2)(x - 2)б) 32c - 2cx^2 = 2c(16 - x^2) = 2c(4 + x)(4 - x)в) by^2 - 16b = b(y^2 - 16) = b(y + 4)(y - 4)г) 8ky^2 - 8k = 8k(y^2 - 1) = 8k(y + 1)(y - 1)
а) 5x^2 - 20 = 5(x^2 - 4) = 5(x + 2)(x - 2)
б) 32c - 2cx^2 = 2c(16 - x^2) = 2c(4 + x)(4 - x)
в) by^2 - 16b = b(y^2 - 16) = b(y + 4)(y - 4)
г) 8ky^2 - 8k = 8k(y^2 - 1) = 8k(y + 1)(y - 1)