I was wondering if there was a way to simplify the formula $\det({\matrix A - b \cdot \matrix I})$ where $\matrix A$ is a $4\times4$ matrix, $b$ an integer and $\matrix I$ the identity matrix.
2026-04-26 00:23:20.1777163000
$\det({\matrix A - b \cdot\matrix I})$ simplification
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