## Algebra 2 (1st Edition)

Published by McDougal Littell

# Chapter 9 Quadratic Relations and Conic Sections - 9.4 Graph and Write Equations of Ellipses - 9.4 Exercises - Mixed Review - Page 639: 55

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#### Work Step by Step

Finding the determinant of the matrix, we obtain: $$\det \begin{pmatrix}-1&-4\\ 3&12\end{pmatrix}\\ \left(-1\right)\cdot \:12-\left(-4\right)\cdot \:3\\ 0$$

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