Algebra 2 (1st Edition)

Published by McDougal Littell
ISBN 10: 0618595414
ISBN 13: 978-0-61859-541-9

Chapter 5 Polynomials and Polynomial Functions - 5.6 Find Rational Zeroes - 5.6 Exercises - Mixed Review - Page 377: 60

Answer

$X=\begin{bmatrix} 3 & -7& -\frac{7}{2}\\ -6 & 12 & \frac{13}{2} \end{bmatrix}$

Work Step by Step

Multiply the inverse of the matrix on the left by the matrix on the right: $X=\begin{bmatrix} 5& 3\\ 4 &2 \end{bmatrix}^{-1}\begin{bmatrix} -3 & 1& 2\\ 0 & -4 &-1 \end{bmatrix}\\=\frac{1}{10-12}\begin{bmatrix} 2 &-3\\ -4 & 5 \end{bmatrix}\begin{bmatrix} -3 & 1& 2\\ 0 & -4 &-1 \end{bmatrix}\\=-\frac{1}{2}\begin{bmatrix} -6 & 2+12 & 4+3\\ 12 & -4-20 & -8-5 \end{bmatrix}\\=\frac{-1}{2}\begin{bmatrix} -6& 14 & 7\\ 12 & -24 & -13 \end{bmatrix}\\=\begin{bmatrix} 3 & -7& -\frac{7}{2}\\ -6 & 12 & \frac{13}{2} \end{bmatrix}$
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