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- 1 decade agoFavorite Answer
what about it? how to find it?

Let's say this is your matrix:

[a b]

c d

now to find the determinant, you just need to multiply "a" with "d" and "c" with "b" then subtract them.

to find the 3 by 3 matrix:

[a b c]

d e f

g h i

1. add the first two columns of your matrix next to the last column.

[a b c a b]

d e f d e

g h i g h

2. then multiply the main diagonals and add

aei + bfg + cdh

3. multiply the opposite diagonals and add

gec + hfa + idb

4. subtract the two answers

5. that's your determinant

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