Algebra 2 (1st Edition)

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

Chapter 3 Linear Systems and Matrices - 3.6 Multiplying Matrices - 3.6 Exercises - Skill Practice - Page 199: 19

Answer

The error appeared in the multiplication. Instead of multiplying the first row of the left matrix with the first row of the second matrix, you should multiply the first row of the left matrix with the first column of the right matrix.

Work Step by Step

Instead of $(3\times7)+(-1\times0)=21$ it should be... $(3\times7)+(-1\times1)=20$
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