Question
A matrix A, of order 3 × 3, has determinant 4. Find the value of | 3 A |
Solution
We are given that | A | = 4 ...(1)
Since A is of order 3 × 3
∴ | 3 A | = 33 |A| = 27 |A|
= 27 × 4 [∵ of (1)]
= 108
