Neco 2025 Further Mathematics Question 46
Practice objective / multiple choice question 46 from the 2025 Neco Further Mathematics examination.
The matrix \(A = \begin{pmatrix}2 & k\\ k & 5\end{pmatrix}\) has integer entries. Determine all integer values of \(k\) for which \(A\) is invertible and its inverse also has integer entries. Then find the trace of \(A^{-1}\).
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About This Question
This is Neco 2025 Further Mathematics Question 46. It is one of the objective questions from the 2025 Neco Further Mathematics examination.
Difficulty level: Medium .
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