Question

Please tell me what is the value of a when a=k

Not from google and please don't spam

And this is not a free point​

Answer 1

.Since A is invertible ⇒AA

−1

=I

∴∣AA

−1

∣=∣I∣

∣A∣∣A

−1

∣=1

∴∣A

−1

∣=

∣A∣

1

.

(detA

−1

)=

det(A)

1

=(det(A))

−1

⟹k=−1

not from google ✌✌..