5x 2 68 July 8, 2019 16 32 64 128 5x 2 68x 192 5x 2 68 90 2 5x 68 289 5x 2 ≥ 68 3x 2 5x 68 17 5x 3 2 68 17 5x 3 2 68 pemfaktoran 5x 2 19x 68 =- 2 2x 5