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Find the matrix $A$.
Mathematics 4024 · O Level · Algebraic manipulation
Algebraic manipulation — practice question
The inverse of matrix $A$ is $\frac{1}{20}\begin{pmatrix}m & 7\\-1 & k\end{pmatrix}$. Here, $m$ and $k$ are positive integers with $m<k$. The determinant of matrix $A$ equals $20$.
Worked solution & mark scheme
This 3-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The matrix is $\begin{pmatrix}13 & -7\\1 & 1\end{pmatrix}$.” …
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