The matrix A = [a 6 b; 2c x+1 8; -1 -8 y-3] is a skew symmetric matrix, then find the value of ab +…

The matrix $A = \begin{bmatrix} a & 6 & b \\ 2c & x+1 & 8 \\ -1 & -8 & y-3 \end{bmatrix}$ is a skew symmetric matrix, then find the value of $ab + bc - xy$.