If A= [ lll 0 & 4 & 9 8 & 3 & 7 ], B= [ lll 7 & 3 & 8 1 & 4 & 9 ]… - Vidyadip

Question

If $A=\left[\begin{array}{lll}0 & 4 & 9 \\ 8 & 3 & 7\end{array}\right], B=\left[\begin{array}{lll}7 & 3 & 8 \\ 1 & 4 & 9\end{array}\right]$ find the value of $3 A-9 B$

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Answer

$\begin{aligned} & 3 A-9 B=3\left[\begin{array}{lll}0 & 4 & 9 \\ 8 & 3 & 7\end{array}\right]-9\left[\begin{array}{lll}7 & 3 & 8 \\ 1 & 4 & 9\end{array}\right] \\ & =\left[\begin{array}{ccc}0 & 12 & 27 \\ 24 & 9 & 21\end{array}\right]-\left[\begin{array}{ccc}63 & 27 & 72 \\ 9 & 36 & 81\end{array}\right] \\ & =\left[\begin{array}{ccc}-63 & -5 & -45 \\ 15 & -27 & -60\end{array}\right]\end{aligned}$

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