Answer
The student didn't factor.
Work Step by Step
Here, you cannot distribute the exponent into the values inside the parenthesis. Rather, you must find $(x+3)(x+3)$. After all:
$$ (a+b)^2 \ne a^2 + b ^ 2 $$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Appendix A - A Exercises - Page A6: 3
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