X 4 3x 3 x 2 27x 90 July 8, 2019 16 32 64 128 X 4 3x 3 19x 2 27x 90 3 * 45 ^ x - 3 * 27 ^ x - 28 * 15 ^ x + 28 * 9 ^ x + 9 * 5 ^ x - 3 ^ (x + 2) = 0
