University Calculus: Early Transcendentals (3rd Edition)

Published by Pearson
ISBN 10: 0321999584
ISBN 13: 978-0-32199-958-0

Chapter 6 - Section 6.3 - Arc Length - Exercises - Page 370: 8

Answer

$$\dfrac{53}{6}$$

Work Step by Step

The arc length can be calculated as follows: $L=\int_{a}^{b} \sqrt {1+[f'(x)]^2} dx$ Re-arrange the given equation such that $[f'(x)]^2=\dfrac{(y-1)^2}{4y}$ After simplification, we have $$L=\int_{0}^{2} [\dfrac{(2x^2+2x+)^2 \cdot (2x^2+6x+5)^2}{16(x+1)^4}] dx $$ Now, we will separate the terms and then integrate: $$L=\int_{0}^{2} x^2+2x+1+\dfrac{1}{4(x+1)^2} dx \\=[\dfrac{x^{3}}{3}+x^2+x-\dfrac{1}{4(x+1)}]_{0}^{2} \\=\dfrac{53}{6}$$
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