det [AB] = 4.1 - 3.2 = -2
adj AB =
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Verified answer
det [AB] = 4.1 - 3.2 = -2
adj AB =![\left[\begin{array}{ccc}1&-3\\-2&4\\\end{array}\right] \left[\begin{array}{ccc}1&-3\\-2&4\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26-3%5C%5C-2%264%5C%5C%5Cend%7Barray%7D%5Cright%5D)