Question

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Answer 1

$X + 2. \left[\begin{array}{ccc}1&2\\0&1\end{array}\right] = \left[\begin{array}{ccc}4&-1\\5&0\end{array}\right]$
$X + \left[\begin{array}{ccc}2&4\\0&2\end{array}\right] = \left[\begin{array}{ccc}4&-1\\5&0\end{array}\right]$
$X = \left[\begin{array}{ccc}4&-1\\5&0\end{array}\right] - \left[\begin{array}{ccc}2&4\\0&2\end{array}\right] = \left[\begin{array}{ccc}2&-5\\5&-2\end{array}\right]$

Letra A.

Espero ter ajudado!