Question

If A is a square matrix such that AA' = 1, then the value of A is (a) +1 (b) +4 (c) 0 (d) + 2​

Answer 1

Answer:

Given

AA

T

=I=A

T

A

⇒

∣

∣

∣

AA

T

∣

∣

∣

=∣I∣=

∣

∣

∣

A

T

A

∣

∣

∣

⇒∣A∣

∣

∣

∣

A

T

∣

∣

∣

=1=

∣

∣

∣

A

T

∣

∣

∣

∣A∣

⇒∣A∣

2

=1

∣

∣

∣

A

T

∣

∣

∣

=∣A∣

⇒∣A∣=±1

Step-by-step explanation:

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Answer 2

Answer:

A. +1

Bruh it's common sense