Question

If $A=\left[\begin{array}{cc}1& 2\end{array}\right],B=\left[\begin{array}{cc}3& 4\end{array}\right],$ then $A-B=$

• A. $\left[\begin{array}{cc}-2& -2\end{array}\right]$
• B. $\left[\begin{array}{cc}2& 2\end{array}\right]$
• C. $\left[\begin{array}{cc}-3& -1\end{array}\right]$
• D. None of these

Answer 1

The correct option is A $\left[\begin{array}{cc}-2& -2\end{array}\right]$

Given, $A=\left[\begin{array}{cc}1& 2\end{array}\right]$ and $B\left[\begin{array}{cc}3& 4\end{array}\right]$

Therefore,

$A-B=\left[\begin{array}{cc}1& 2\end{array}\right]-\left[\begin{array}{cc}3& 4\end{array}\right]$

$A-B=\left[\begin{array}{cc}1-3& 2-4\end{array}\right]$

$A-B=\left[\begin{array}{cc}-2& -2\end{array}\right]$