Question

A=(1/2) , B=(3,–1). Find adj(AB)

Answer 1

Answer:

Given, A=[5723]

Therefore,

∣A∣=∣∣∣∣∣∣5723∣∣∣∣∣∣=15−14=1

We know that, |adj (A)| = ∣A∣n−1, where n is order of determinant.

Therefore,

∣adj(A)∣=∣1∣2−1

∣adj(A)∣=1