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$$ \begin{pmatrix} 2 & 4 & k \\ 1 & 3 & 2 \\ 3 & k & 9 \\ \end{pmatrix} $$

For what values of $k$ is the above matrix not invertible.

Need help. Don't know where to start really. Thanks.`

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1 Answer 1

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Hint: A matrix is not invertible iff it's determinant is zero

Solve for the value of $k$ that makes the determinant $0$

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