Answer
7
Work Step by Step
Since there is no denominator, simply plug in 12. So $12^2 $ is 144 and 144 plus 25 is 169 and $\sqrt {169}=13$ and 13 minus $\sqrt {(3 \times 12)}$ is 13-6 or 7.
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 13 - Section 13.2 - Finding Limits Algebraically - 13.2 Exercises - Page 913: 17
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