Hey, I present to you two problems:

First one:

To find the Inverse of the matrix

in

9.

I have worked out the determinent which is equal to 12, but in

9 that is equal to 3.

Nop. That matrix's determinant is ...., and thus:

because .

Tonio
I know I have to inverse the determinent in

9 but I am a little unsure about how to do that. But I'm stuck at the line:

in

9

Second one:

Given a matrix:

in

101. work out

and find

where m = 34 and n = 84.

I have worked out

but I'm not sure how to proceed with the other part, I think I must use Euler's formula, but that specifies for two numbers pq that are prime, clearly 34 and 84 are not.

Regards