 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2011/paper-1/13/a/i/solution

For the two-by-two matrix, take the product of the diagonal entries minus the product of the off-diagonal entries:

det A = 5 \cdot 5 - (- 3) (- 3) = 16.

In particular,

A

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