Question

find A of square matrix of order 2 and A inverse = adjacent A divided by 8 find determined 3A​

Answer 1

Answer:

Given A is a matrix of order 3

⟹∣A∣=5

⟹∣adjA∣=∣A∣

(3−1)=∣A∣

2 =5

2 =25

∣A adjA∣=∣A∣×∣adjA∣=5×25=125