If ![A=\left[\begin{array}{ccc}1&2\\4&2\end{array}\right]](https://tex.z-dn.net/?f=A%3D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7D1%26amp%3B2%5C%5C4%26amp%3B2%5Cend%7Barray%7D%5Cright%5D "A=\left[\begin{array}{ccc}1&2\\4&2\end{array}\right]")
, then show that | 2A | = 4 | A |
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sorry I could not answer
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