Hanf1iej7ayaIristiec Hanf1iej7ayaIristiec 21-12-2016 Mathematics contestada Factor k 2 8k 15. user: -x 2 y 2 x 4 4y 2 - 4x 2 user: select the correct difference. 5d 2 4d - 3 less 3d 2 - 2d 4