If A is a 3 × 3 matrix and A = 1 2 then A - 1 Adj AdjA - 1 =

Question

If A is a 3 × 3 matrix and A = 1 2 then A - 1 Adj AdjA - 1 =, 8, 1 8, 1 2, 2

MARKS App · Accepted Answer

Given, A is a 3 × 3 matrix and A = 1 2 Then A - 1 Adj AdjA - 1 = A - 1 A 2 2 - 1 ⇒ A - 1 Adj AdjA - 1 = A - 1 A 4 - 1 ⇒ A - 1 Adj AdjA - 1 = A 3 - 1 ⇒ A - 1 Adj AdjA - 1 = 1 A 3 ⇒ A - 1 Adj AdjA - 1 = 2 3 = 8

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