Question

Given that A is a square matrix of order 3 and |A| = −4, then |adj A| is equal to:

Options

• −4

• 4

• −16

• 16

Answer 1

16

Explanation:

as |adj A| = |A|ⁿ⁻¹, where n is order of the square matrix A

= (−4)²

= 16