Question:
If $A\left(\begin{array}{cc}3 & 2 \\ 1 & -1\end{array}\right)=\left(\begin{array}{ll}4 & 1 \\ 2 & 3\end{array}\right)$ then $A=$ ?
A. $\left(\begin{array}{cc}1 & -1 \\ 1 & 1\end{array}\right)$
B. $\left(\begin{array}{cc}1 & 1 \\ -1 & 1\end{array}\right)$
C. $\left(\begin{array}{cc}1 & 1 \\ 1 & -1\end{array}\right)$
D. none of these
Solution:
