How to Find Minors and Cofactors of a Matrix

SOLVED: 1. Can we use cofactor expansion in a 2x2 matrix?2. What is the determinant of a 1x1 matrix?

Cofactor Matrix | Definition, Calculation & Use

SOLVED:Find the cofactor of each element in the second row of each matrix. See Example 2 . [ 1 2 -1 2 3 -2 -1 4 1]

SOLVED: Compute the determinant by cofactor expansion: At each step, choose a row or column that involves the least amount of computation.(Simplify your answer:)-3