Question:
If $(2 A-B)=\left(\begin{array}{ccc}6 & -6 & 0 \\ -4 & 2 & 1\end{array}\right)$ and $(2 B+A)=\left(\begin{array}{lll}3 & 2 & 5 \\ -2 & 1 & -7\end{array}\right)$ then $A=?$
A. $\left(\begin{array}{llr}-3 & 2 & 1 \\ 2 & 1 & -1\end{array}\right)$
B. $\left(\begin{array}{ccc}3 & 2 & -1 \\ 2 & -1 & 1\end{array}\right)$
C. $\left(\begin{array}{lll}3 & -2 & 1 \\ -2 & 1 & -1\end{array}\right)$
D. none of these
Solution:
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