A)(x - 8)(x + 5) = x^2 - 8x + 5x - 40 = x^2 - 3x - 40
б) (3b - 2)(4b - 2) = 12b^2 - 8b - 6b + 4 = 12b^2 -14b + 4
в) (6a + x)(2a - 3x) = 12a^2 + 2ax - 18ax - 3x^2 = 12a^2 - 16ax - 3x^2
г) (c + 1) (c^2 + 3c + 2) = c^3 + c^2 + 3c^2 + 3c + 2c + 2 = c^3 + 4c^2 + 5c + 2