Question

$Suppose A= \left[\begin{array}{ccc}3&1&1\\-12&-3&0\\-9&-1&-12\end{array}\right] and B=\left[\begin{array}{ccc}2&-1&0\\-3&2&-4\\5&1&9\end{array}\right] and 3A+4B-X=0, then find matrix X.$

Answer 1

Dear Student:

Clearly X= 3A+4B

Use notation given in the attachment.