Question

determinants of matrix [3 4 7]
[2 1 3]
[-5 -1 2]​

Answer 1

Step-by-step explanation:

The concept of determinant is defined only for square matrices(A matrix with equal number of rows and columns is called a square matrix). Since a 3x4 matrix is not a square matrix,it does not have a determinant.

Answer 2

D=3(2+3)-4(4+15)+7(-2+5)
= -40