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Find adj A for A with rows (2, 3) and (1, 4).
ARows (4,3), (1,2)
BRows (4,-3), (-1,2)
CRows (4,-1), (-3,2)
DRows (2,-3), (-1,4)
Answer & Solution
Correct answer: B. Rows (4,-3), (-1,2)
For a 2 by 2 matrix swap the diagonal entries and negate the off-diagonal ones, giving rows (4,-3) and (-1,2).
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