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# Matrices Solving

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Let $${A} = \begin{pmatrix} 0 & 5 & 7 \\ -2 & 7 & 7 \\ -1 & 1 & 4 \end{pmatrix}$$. Find all values of $$t$$ such that $$\det (t{I} - {A}) = 0$$, where $$I$$ is the $$3 \times 3$$ identity matrix.

May 30, 2020

#1
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This is asking for the eigenvalues of matrix A:

May 30, 2020
edited by Alan  May 30, 2020