Algebra 2 (1st Edition)

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

Chapter 3 Linear Systems and Matrices - Chapter Test - Page 227: 25

Answer

$-54$

Work Step by Step

We know that for a matrix \[ \left[\begin{array}{rrr} a & b & c \\ d &e & f \\ g &h & i \\ \end{array} \right] \] the determinant, $D=a(ei-fh)-b(di-fg)+c(dh-eg).$ Hence here $D=-1(2\cdot-2-(-3)\cdot1)-3(0\cdot-2-(-3)\cdot5)+1(0\cdot1-2\cdot5)=-1(-1)-3(15)+1(-10)=-54.$
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