Question

Which expression represents the determinant of

A = [2 3]
[1 9]

(A) det(A) = (2)(9) - (1)(3)
(B) det(A) = (2)(9) + (1)(3)
(C) det(A) = (2)(3) - (1969)
(D) det(A) = (2)(3) + (1)(9)​

Answer 1

A) det(A)= (2)(9)-(1)(3)

Explanation:

determinant is 15