Q29 of 256 Page 7

If A is a square matrix of order n × n such that |A| = λ, then write the value of |-A|.

Since |kA|= km|A|

Given that k=-1, m=n and |A|=λ, we get


|-A|=(-1)n×λ


Hence, |-A|=λ if n is even and |-A|=-λ if n is odd.


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