Answer
The result of a matrix cannot have different dimensions than the original matrix.
Work Step by Step
Correcting the student's error:
$$\begin{bmatrix} 9 +4.1 \\ -5+3.8 \end{bmatrix}= \begin{bmatrix} 13.1\\ -1.2 \end{bmatrix}$$
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 3 Linear Systems and Matrices - 3.5 Perform Basic Matrix Operations - 3.5 Exercises - Skill Practice - Page 190: 3
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