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The adjoint of the matrix with rows (2, 5) and (1, 3) has which rows?
A(3, -5) and (-1, 2)
B(3, 5) and (1, 2)
C(2, -5) and (-1, 3)
D(-3, 5) and (1, -2)
Answer & Solution
Correct answer: A. (3, -5) and (-1, 2)
For a 2 by 2 matrix, swap the diagonal entries and negate the off-diagonal ones, giving rows (3, -5) and (-1, 2).
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