Jawapan

2016-06-17T16:38:05+08:00
Contohnya soalan
(a) (3a-9b)=3(a-3b)
(b) (1-9n)=(1²-3²n)
               =(1-3n)(1+3n)
(c) 2ab+2ac+b+c
= 2ab+b+2ac+c
=b(2a+1)+c(2a+1)
=(2a+1)(b+c)