Question:
If $A=\left(\begin{array}{cc}3 & -4 \\ -1 & 2\end{array}\right)$ and $B$ is a square matrix of order 2 such that $A B=1$ then $B=$ ?
A. $\left(\begin{array}{ll}1 & 2 \\ 2 & 3\end{array}\right)$
B. $\left(\begin{array}{ll}1 & \frac{1}{2} \\ 2 & \frac{3}{2}\end{array}\right)$
c. $\left(\begin{array}{cc}1 & 2 \\ \frac{1}{2} & \frac{3}{2}\end{array}\right)$
D.None of these
Solution:
