First, let's look at the definitions of addition and multiplication of matrices.

Secondly, don't think so complicated, just let you calculate a formula of 2-5A+3, where A is a square of 2*2, ignoring F and so on.

Finally, if you don't know identity matrix, or don't understand the "+3" in 2-5A+3:

3 * I =(3 ^ 0

0 3)

The formula a2-5a+3 = (2-1) * (2-1)-(10-5)+(30).

-3 3 -3 3 - 15 15 0 3

By the way, the copied inscription is well written. In fact, we teach writing to draw.

I hope I can help you. If you don't understand, just add a q, 735840807.