Question

How do you find the determinant of `((3, 1, -2), (4, 2, 5), (-6, 3, -1))`?

Answer 1

`–125`

Explanation:

We find it by using the criss-cross method.

`det((3, 1, -2), (4, 2, 5), (-6, 3, -1))=3(2)(–1)+1(5)(–6)+(–2)(4)(3)-(–2)(2)(–6)-1(4)(–1)-3(5)(3)=–125`