MatricesMedium
Question
If 
is the adjoint of a 3 × 3 matrix A and |A| = 4, then α is equal to
is the adjoint of a 3 × 3 matrix A and |A| = 4, then α is equal toOptions
A.4
B.11
C.5
D.0
Solution
|P| = 2(α - 3)
|P| = adjA ⇒ |P| = |A|2 ⇒ 2(α - 3) = 16
⇒ α = 11
|P| = adjA ⇒ |P| = |A|2 ⇒ 2(α - 3) = 16
⇒ α = 11
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