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## Homework Statement

__question 1:__If A is a matrix satisfying 3A^2+6A-I=0, find the inverse of A.

__question 2:__Let A be a 3x3 matrix with 4A = A^7. Find the possible values det A.

## Homework Equations

none

## The Attempt at a Solution

this was a very long homework about 17 questions, i solved the others but i got no clue where to start with these, any help is appreciated.

Best Regards.