# Determinants of Matrix of Order One and Two

#### notes

Determinant of a matrix of order one:
Let A = [a] be the matrix of order 1, then determinant of A is defined to be equal to a
Determinant of a matrix of order two:
Let A =[(a_11,a_12),(a_21,a_22)] be a matrix of order 2 xx 2,
then the determinant of A is defined as:

det (A) = |A| = ∆ = |(a_11,a_12),(a_21,a_22)| = a_11a_22 - a_21a_12

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Determinants part 2 (Matrix Order 1 ,2, 3) [00:13:22]
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