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No..

would you write the matrix as 4 -1
1 2

That is part #1. Very good. Next...

what do you mean by augment it by I2?

\[\left[\begin{matrix}4 & -1 & 1 & 0\\ 1 & 2 & 0 & 1\end{matrix}\right]\]

why did you do that? sorry i'm confused

Well, this is one very useful way to find an Inverse Matrix. You've never seen it, before?

I may have but I forgot how to do it

How about "Elementary Row Operations"? Any of those floating around in your bag of tricks?

I wish I could say yes but no. I'm retaking a pre-calc course because i failed it the first time

ok thanks!!