Scalar multiplication: Find the value of the matrix — task. Mathematics State Board, Class 10.

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Determine

$3A - 5B$ , if

$A =\begin{bmatrix} 2 & 4 & 6\\ 7 & 5 & -4\\ -2 & 1 & 7 \end{bmatrix}, B = \begin{bmatrix} 2 & 4 & 6\\ 7 & 5 & 3\\ 7 & 1 & 7 \end{bmatrix}$

$\begin{bmatrix} -4 & -8 & -12\\ -14 & 40 & 3\\ 29& 8 & 56 \end{bmatrix}$
$\begin{bmatrix} 3 & -8 & 8\\ -10 & 40 & -4\\ 29 & -12 & 21 \end{bmatrix}$
$\begin{bmatrix} 8 & 29 & -12\\ 3 & 40 & -14\\ -8 & -4 & 56 \end{bmatrix}$

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