If A = bmatrix 2 & -3 4 & 1 bmatrix , then A + adj A is

MHT CET 2022 Mathematics question

If , then is

(A)Correct
(B)
(C)
(D)

Answer: (A)

Solution

For a matrix , the adjoint is obtained by swapping the diagonal entries and changing the sign of the off-diagonal entries: . So \begin{bmatrix}$ 1 & 3 -4 & 2

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Question ID VK-095969