X 4 3x 3 2x 2 9x 9 0 July 8, 2019 16 32 64 128 3 x 3 = 9 9 * 3 ^ (x ^ 2 - 4x) 3 ^ - 1 4(9x + 3) - 9(4x + 3) 3x (x-2)(x+9) 0