Calculus: Early Transcendentals 9th Edition

Published by Cengage Learning
ISBN 10: 1337613924
ISBN 13: 978-1-33761-392-7

Chapter 10 - Section 10.2 - Calculus with Parametric Curves - 10.2 Exercises - Page 681: 35

Answer

$\frac{24}{5}$

Work Step by Step

$x=t^3+1$ and $y=2t-t^2$ Find the intersection points between the curve and the x-axis: $y=0$ $2t-t^2=0$ $t(2-t)=0$ $t=0\vee t=2$ For $t=0$, $x=0^3+1=1$ For $t=2$, $x=2^3+1=9$ Then, the curve above the x-axis is given by $g(t)=2t-t^2$ and $f(t)=t^3+1$ where $0\leq t\leq 2$. Find the area: $A=\int_0^2g(t)f'(t)dt$ $A=\int_0^2(2t-t^2)(3t^2)dt$ $A=\int_0^26t^3-3t^4dt$ $A=[\frac{3t^4}{2}-\frac{3t^5}{5}]_0^2$ $A=(\frac{3\cdot 2^4}{2}-\frac{3\cdot 2^5}{5})-(\frac{3\cdot 0^4}{2}-\frac{3\cdot 0^5}{5})$ $A=(24-\frac{96}{5})-0$ $A=\frac{24}{5}$ Thus, the area is $\frac{24}{5}$.
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