Calculus 8th Edition

Published by Cengage
ISBN 10: 1285740629
ISBN 13: 978-1-28574-062-1

Chapter 4 - Integrals - 4.5 The Substitution Rule - 4.5 Exercises - Page 347: 59



Work Step by Step

To find the integral $$\int_0^2f(2x)dx$$ we will use substitution $2x=t$ which gives us $2dx=dt\Rightarrow dx=\frac{dt}{2}$ and integration bounds will be: for $x=0$ we have $t=0$ and for $x=2$ we have $t=4$. Putting this into the integral we get: $$\int_0^2f(2x)dx=\int_0^4f(t)\frac{dt}{2}=\frac{1}{2}\int_0^4f(t)dt$$ Based on the preposition that $$\int_0^4f(x)dx=10$$ (doesn't metter how we name the integration varialble), we now have: $$\int_0^2f(2x)dx=\frac{1}{2}\int_0^4f(t)dt=\frac{1}{2}\cdot10=5$$
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