Matrices and Determinants: JEE Main 2024 Mathematics question

Let $A$ be a $2 \times 2$ real matrix and $I$ be the identity matrix of order 2. If the roots of the equation $|\mathrm{A}-x \mathrm{I}|=0$ be $-1$ and 3, then the sum of the diagonal elements of the matrix $\mathrm{A}^2$ is