Given: To find: A 4 A 4 = A × A × A × A ⇒ A 4 = A 2 × A 2 So, ⇒ A 2 = 9I ∵ A 4 = A 2 × A 2 = 9I × 9I = 81 I 2 = 81 I [ ∵ I 2 = I]

If , find A⁴.

Given:

To find: A⁴

A⁴ = A × A × A × A

⇒ A⁴ = A² × A²

So,

⇒ A² = 9I

∵ A⁴ = A² × A²

= 9I × 9I

= 81 I²

= 81 I [∵ I² = I]

If , find A4.