Question

Find adj A, if A = `[(2, -1),(4, 3)]`.

Answer 1

Given, A = `[(2, -1),(4, 3)]`

C₁₁ = 3, C₁₂ = – 4

C₂₁ = 1, C₂₂ = 2

Adj A = `[("C"_11, "C"_12),("C"_21, "C"_22)]^"T"`

= `[(3, -4),(1, 2)]^"T"`

Adj A = `[(3, 1),(-4, 2)]`