Answer
The student violated the rule of square roots.
Work Step by Step
When you have two things added under a square root symbol, you cannot just add the square roots of each individual term to each other.
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: 5
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