Jawabanmu

2014-08-22T18:40:51+07:00
1. (a+b)(a-b)= a^2 -ab +ab -b^2 = a^2 -b^2
2
a. (a+b)^2 = a^2 +2ab +b^2
b. (a-b)^2 = a^2 -2ab +b^2
C. (ax+b)(cx+d)= acx^2 +ad +bcx +bd