X 2 2 81 0 July 8, 2019 16 32 64 128 X 2 81 0 solve by factoring X 2 81 0 square roots X 2 81 0 factor Х 2 81 0 X 2 81 2 x 2 5x 36 2 0 X 2 81 0 quadratic equation X 2 - 81≤0 81 - x ^ 2 = 0