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In the inverse of the matrix with rows (3, 2) and (4, 3), what is the entry in row 1, column 2?
A-2
B2
C-4
D3
Answer & Solution
Correct answer: A. -2
The determinant is 9 - 8 = 1, so the inverse has rows (3, -2) and (-4, 3); the entry asked is -2.
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