Question

if A is a square matrix of order 3 and |A|= -2 then find |3adjA|​

Answer 1

Answer:

|3adj| = -18

Step-by-step explanation:

|A| = -2

n = 3

|3adj| = 3^n |adjA|

|3adj| = 3^3 (-2)

|3adj| = 9(-2)

|3adj| = -18

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