X 2 18x 81 1 July 8, 2019 16 32 64 128 X 2 18x 81 16 X 2 18x 81 15 X 2 18x 81 100 X 2 18x 81 2x 2 14x X 2 − 18x 81 x 2 − 14x 45 X ^ 2 - 18x + 81 = 0 X 2 −18x+81=0