Calculus 8th Edition

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

Chapter 5 - Applications of Integration - Review - Exercises - Page 393: 2

Answer

$\frac{55}{12}$

Work Step by Step

The area between two curves $y=f(x)$ and $y=g(x)$ between $x=a$ and $x=b$ is given by the formula: $$A=\int_a^b |f(x)-g(x)|dx.\quad\quad\quad(1)$$ Given $$f(x)=\sqrt{x}, \quad g(x)=-\sqrt[3]{x}, \quad h(x)=x-2$$ First , we find the intersection points \begin{aligned} y^2&= y+2\\ y^2-y-2&=0\\ (y-2)(y+1)&=0 \end{aligned} Then $$y=2,\ \ \ \ y=-1 $$ and for $y=\sqrt{x},\ \ y=-\sqrt[3]{x}\ \ \to y=0$, since $$y+2 \geq -y^3,\ \ -1\leq y\leq 0\ \ \text{and}\ \ y+2\geq y^2\ \ , 0\leq y\leq 2 $$Then \begin{aligned} \text{Area} &= \int_{-1}^0\left[\left(y+2\right)+y^3\right] d y+ \int_0^2 [ (y+2)-y^2]dy\\ &= \left(\frac{1}{2}y^2+2y+\frac{1}{4}y^4\right)\bigg|_{-1}^0+ \left(\frac{1}{2}y^2+2y-\frac{1}{3}y^3\right)\bigg|_0^2\\ &= \frac{5}{4} + \frac{10}{3}\\ &= \frac{55}{12} \end{aligned}
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