If $A = \left(\begin{array}{cc}2& -1\\ 3& 4\end{array}\right)$ then $\left|A^2\right|= \_\_\_\_$

For matrix $A = \left[\begin{array}{ccc}3& 1& -5\\ 2& -4& 0\\ 8& 7& -6\end{array}\right]$ the cofactor of 7 is $\_\_\_\_\_$

If $A^2 - A - I = 0$ then $A^{-1} = \_\_\_\_\_$

If $A = \left[\begin{array}{cc}4& X+2\\ 2X-3& X+1\end{array}\right]$ is symmetric matrix then $X = \_\_\_\_\_$

If $A = \left[\begin{array}{cc}2& 3\end{array}\right]$ and $B = \left[\begin{array}{c}3\\ -1\end{array}\right]$ then $A\times B =\_\_\_\_\_\_$

If $x +\left(\begin{array}{cc}-3& 2\\ 5& 7\end{array}\right) =\left(\begin{array}{cc}-2& 4\\ 8& 11\end{array}\right)$ then $x = \_\_\_\_\_\_$

If $A = \left(\begin{array}{cc}1& 2\\ 3& 4\end{array}\right)$ then $A^2 = \_\_\_\_\_$

If $\left(\begin{array}{cc}2& -7\\ 9& 4-3x\end{array}\right) = \left(\begin{array}{cc}2& -7\\ 9& 13\end{array}\right)$ then $x = \_\_\_\_\_$

If $A = \left(\begin{array}{cc}1& 2\\ 2& 1\end{array}\right)$   and $B = \left(\begin{array}{cc}-2& 1\\ 1& -2\end{array}\right)$ then $AB = \_\_\_\_\_$

For matrix A and B , $A{B}^T = \_\_\_\_\_$