4 2 81 0 July 8, 2019 16 32 64 128 X 4 2 81 0 5x 4 2 81 0 5х 4 2 81 0 X 4 18x 2 81 0 X 4 82x 2 81 0 4x 4 45x 2 81 0 S 4 2 81 0 extracting square roots 5 4 2 81 0 W 4 18w 2 81 0 8x 4 54x 2 81 0 M 4 18m 2 81 0 4x 4 − 85x 2 81 0 25x 4 − 2026x 2 81 0 D 4 18d 2 81 y 0