Question

If $A=\left(\begin{array}{cc}2& 3\\ -9& 5\end{array}\right)-\left(\begin{array}{cc}1& 5\\ 7& -1\end{array}\right)$ then find the additive inverse of $A$

Answer 1

A= $\left(\begin{array}{cc}2& 3\\ -9& 5\end{array}\right)$ - $\left(\begin{array}{cc}1& 5\\ 7& -1\end{array}\right)$ = $\left(\begin{array}{cc}2-1& 3-5\\ -9-7& 5-(-1)\end{array}\right)$

A= $\Rightarrow$ $\left(\begin{array}{cc}1& -2\\ -16& 6\end{array}\right)$
Additive inverse of A= $\left(\begin{array}{cc}-1& 2\\ 16& -6\end{array}\right)$