Jawabanmu

2014-08-06T22:15:08+07:00
(2√7 + 4√5) (2√7 + 4√5
= [(
2√7*2√7) +(2√7* 4√5+ 4√5*2√7) + ( 4√5* 4√5)]
=[(4*7)+(8√35+8√35)+(16*5)]
=28+16
√35+80
=108+16√35

semoga membantu :-)