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12-9.

$\begin{bmatrix}1(a)+0(c)&1(b)+0(d)\\-1(a)+2(c)&-1(b)+2(d)\end{bmatrix}$

$I=\begin{bmatrix}1&0\\0&1\end{bmatrix}$

Using the lower left entry from part (a) and matrix I:
−1(a) + 2(c) = 0
Now repeat this process for the rest of the entries.

Look at part (b) and remember that M(M−1) = I.