X 2 18x 81 5 July 8, 2019 16 32 64 128 X 2 18x 81 5 using square roots X 2 18x 81 5 solve using square roots (x ^ 2 * (5 - x))/(x ^ 2 - 18x + 81) = 0 X 2 + 18 x + 81 = 0