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find the minor M13 and its cofactor C13 of the matrix

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1.find the minor M13 and its cofactor C13 of the matrix

6 -4 16
-6 4 -12
2 -6 12

2.calculate the determinant

9 4 -9
0 -6 2
45 8 5

 

asked Feb 12, 2016 in ALGEBRA 1 by anonymous

2 Answers

0 votes

1.

The matrix is image.

Find image.

If is a square matrix  then minor of its entry image is denoted by image.

It is defined as the determinent of the submatrix obtained by removing from its image row and image column.

image is the minor of element image in image.

Therefore, image.

image.

Find Cofactor image.

Cofactor of the entry image is denoted by image and is defined as image.

image

image

image.

answered Feb 12, 2016 by cameron Mentor
edited Feb 12, 2016 by cameron
0 votes

2.

The matrix is image.

Find image.

image

image

Determinant of is image.

answered Feb 12, 2016 by cameron Mentor

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