Jawabanmu

2014-08-29T19:07:47+07:00
2a2 + 3ab-7-5a2+2ab-4
= 2a2 - 5a2 +3ab+2ab -5a -4
=-3a2 (pangkat 2) +5ab  -5a - 4
2014-08-29T19:11:34+07:00
2a²+3ab-7-5a²+2ab-4 =2a²-5a²+3ab+2ab-4 =-3a²+5ab-11