University Calculus: Early Transcendentals (3rd Edition)

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

Chapter 4 - Section 4.1 - Extreme Values of Functions - Exercises - Page 216: 50

Answer

the critical points are: (0,0), (4,8)

Work Step by Step

Given $y=\frac{(x)^2}{x-2}$ The critical point occurs where the first derivative is zero: so $\frac{dy}{dx}=\frac{d{\frac{(x)^2}{x-2})}}{dx}$ ${\frac{dy}{dx}}=\frac{{2(x)}({x-2})-x^2}{(x-2)^2}$ ${\frac{dy}{dx}}=\frac{((x^2)-4x)}{(x-2)^2}$ so the critical point is: ${\frac{dy}{dx}}=0$ $f'(x)=\frac{((x^2)-4x)}{(x-2)^2}=0$ $x^2-4x=0$ since the denominator is undefined at $x=2$, this is not a critical point. $x=0,x=4$ the critical value of y can be obtained by putting in the value of x: $y=\frac{((x^2))}{(x-2)}=0$ $y=\frac{((x^2))}{(x-2)}=8$ thus the critical points are: (0,0), (4,8)
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