(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Let A =

[ 3 2 ]

[ 6 7 ]

Find the following:

(a) det (A) = __

(b) the matrix of cofactors C = (__, __) (__, __)

(c) adj (A) = (__, __) (__, __)

(d) A^-1 = (__,__) (__, __)

2. Relevant equations

I am just not to familiar with what cofactor means, and adj(A), A^-1, as well as det(A).

How can I find all that from one matrix?

3. The attempt at a solution

I put the matrix into RREF, but for the determinant don't I have to like multiply diagonally or something?

Thank YOU!

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# Matrix cofactor problem

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