Answer
$$\begin{bmatrix} -3&5.1&2.4 \\ 8.1&0&-4.5 \end{bmatrix}$$
Work Step by Step
Using the distributive property for matrices:
$$\begin{bmatrix} -3&5.1&2.4 \\ 8.1&0&-4.5 \end{bmatrix}$$
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