(adsbygoogle = window.adsbygoogle || []).push({}); Subgroup help plz! Urgent!

Hi,

Can anyone help me with the following question? Many thanks! Again I'm working from a book so I'm must trying to apply theory to exercises -__-

http://i12.tinypic.com/3zsyuf8.jpg

How do I show that the identity lies in this? And also show that we have closure? Do I just choose any values of a, b and c and multiply two matrices?

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# Homework Help: Subgroup help !

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