Question

If A = `[(α, β),(ϒ, α)]`, then Adj. A is equal to ______.

Options

• `[(δ, − ϒ), (−β, α)]`

• `[(δ, −β), (− ϒ, α)]`

• `[(−δ, β), (ϒ, −α)]`

• `[(−δ, −β), (ϒ, α)]`

Answer 1

If A = `[(α, β),(ϒ, α)]`, then Adj. A is equal to`bbunderline[(δ, −β), (− ϒ, α)]`.

Explanation:

Let A = `[(α, β),(ϒ, α)]`,

C₁₁ = δ, C12 = −ϒ, C₁₂ = −β, C₂₂ = α

∴ adj A = `[(δ, −ϒ), (−β, α)]` = `[(δ, −β), (−ϒ, α)]`