Question

Find the determinant of the matrix -

2 -1 4
4 -3 1
1 2 1

It is a 3*3 matrix.

Answer 1

Answer:

A=[

−1

2

4

3

]

∣A∣=

∣

∣

∣

∣

∣

∣

−1

2

4

3

∣

∣

∣

∣

∣

∣

=−1×3−2×4

=−3−8=−11

Answer 2

Example:

B =

 

1234

The symbol for determinant is two vertical lines either side like this:

|B| = 1×4 − 2×3

= 4 − 6

= −2