Find the sum and product of the given polynomials in the given polynomail ring
(1) f(x) = 4x - 5 + g(x) = 2x² - 4x + 2 in Zs[r]. (2) f(x) = 2r² + 3r + 4, g(x) - 3X² + 2r + 3in Z6[r]
(3) f(x) = 2r⁴ + 4r³ + 3x + 2, g(x) - 3r⁴ + 2r + 4 in Zs [r]