Jawapan

2015-10-01T21:47:10+08:00
2kh

klau ade +

2h + hk

klau ade -

2h - hk 
2015-10-01T21:48:39+08:00
= h(2 k)
= 2hk
____

= h(2 + k)
= 2h + hk

____

= h(2 - k)
= 2h - hk