X 4 8 2 9 0 July 8, 2019 16 32 64 128 X 3 4 8 x 3 2 9 0 X 1 4 8 x 1 2 9 0 X 5 4 8 x 5 2 9 0 Х 5 4 8 х 5 2 9 0 2 x 4 8 9 7 x 0 X mũ 4 trừ 8 x mũ 2 9 0 4 ^ x - 9 * 2 ^ x + 8 = 0 X 4 − 8 x 2 − 9 = 0 X ^ 4 - 8x ^ 2 - 9 = 0
