Question

solve the b question and plz give me the solution also

Answer 1

I would Recommend you to do it yourself !! I am giving you the steps to be followed in the Question !

Step 1 - multiply the given matrix to itself to get the value of A²

Step 2 get the value of 3A which is 3 multiplied to the matrix  which gives $\left[\begin{array}{cc}9&-3\\0&6\end{array}\right]$

Step 4- the value of 5I is $\left[\begin{array}{cc}5&0\\0&5&\end{array}\right]$

Step 5 Put all the values on place and then u get the answer !!