5 2x x 2 ≤ 4x 10 July 8, 2019 16 32 64 128 5 2x x 2 4x 10 1 2x - x 2 (- 5 4x 10 2x 5 2 4x 10 x 3 x 2 6x 9 0 2 x 2 5 5 x 5 x 5