Question

If $A=\left[\begin{array}{ccc}6& x& 2\\ 2& -1& 2\\ -10& 5& 2\end{array}\right]$ then 2A=?

Answer 1

We have,

$A=\left[\begin{array}{ccc}6& x& 2\\ 2& -1& 2\\ -10& 5& 2\end{array}\right]$

then,

$2A$=$2\left[\begin{array}{ccc}6& x& 2\\ 2& -1& 2\\ -10& 5& 2\end{array}\right]$

$2A$=$\left[\begin{array}{ccc}2.6& 2.x& 2.2\\ 2.2& 2.-1& 2.2\\ 2.-10& 2.5& 2.2\end{array}\right]$

$2A$=$A=\left[\begin{array}{ccc}12& 2x& 4\\ 4& -2& 4\\ -20& 10& 4\end{array}\right]$

Hence, this is the answer.