DeterminantHard

Question

If A = diag (2, - 1, 3), B = diag (-1, 3, 2), then A2B = 

Options

A.diag (5, 4, 11)
B.diag (- 4, 3, 18)
C.diag (3, 1, 8)
D.B

Solution

A = diag (2, -1, 3), B = diag (-1, 3, 2) then A2 B = ?
A =    , B =
A2 =
A2B = = diag (- 4, 3, 18)

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