X 2 15 4 3 x 2 5 July 8, 2019 16 32 64 128 15 x 2 mũ 3 4 x 3 mũ 2 5 x 7 (x + 15)/4 - 21/(x + 2) = 2 2/(x - 5) - 4/(x + 5) = (x ^ 2 + 15)/(x ^ 2 - 25)
