Jawabanmu

2014-09-01T19:15:54+07:00
1.3x2 + x + 2
2.7ab - 7bc
3.-4x2 - 6x + 8
2014-09-01T19:16:11+07:00
1.  4x2 + x -x2 + 2 = 4x2 - x2 + x+2 = 5x2-x+2
2. 2ab-3bc+5ba-4cb = 2ab+5ab-3bc-4bc = 7ab-7bc