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Find the value of if and .
Find the value of $k$ if $M = \begin{pmatrix} 1 & 2 \\ 2 & 3 \end{pmatrix}$ and $M^2 - kM - I_2 = 0$.
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From ISC 2018 Specimen Mathematics Paper 1, question 1(iv).
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From ISC 2018 Specimen Mathematics Paper 1, question 1(iv).