Jawabanmu

2014-09-08T18:33:07+07:00
A. a^{2}  + 2ab +  b^{2} 


B.a^{2}  - 2ab -  b^{2}


II.
a. 20xy-100x 
b. 5 x^{2} - 24x + 5
c.4 x^{2} - 49