Thomas' Calculus 13th Edition

Published by Pearson
ISBN 10: 0-32187-896-5
ISBN 13: 978-0-32187-896-0

Chapter 11: Parametric Equations and Polar Coordinates - Section 11.6 - Conic Sections - Exercises 11.6 - Page 679: 53

Answer

$ \displaystyle \frac{(x-2)^{2}}{4}-\frac{(y-2)^{2}}{5}=1$ New foci:$\quad (5, 2)$ and $(-1,2)$ New vertices:$\quad (4, 2)$ and $(0,2)$ New center:$\quad (2,2)$ New asymptotes:$\displaystyle \quad y-2=\pm\frac{\sqrt{5}}{2}(x-2) $

Work Step by Step

Shift right by $2 \Rightarrow$ in the equation, replace $x$ with $x-2$ Shift up by $2 \Rightarrow$ in the equation, replace $y$ with $y-2$ New equation:$\displaystyle \quad \frac{(x-2)^{2}}{4}-\frac{(y-2)^{2}}{5}=1$ The hyperbola $\displaystyle \frac{x^{2}}{4}-\frac{y^{2}}{5}=1$ has the form for which: foci are on the x-axis$, \quad a=2, b=\sqrt{5},$ Center-to-focus distance: $\quad c=\sqrt{a^{2}+b^{2}}=\sqrt{4+5}=3$ Foci: $\quad (\pm c, 0)= \quad (\pm 3, 0)$ Vertices: $\quad (\pm 2, 0)$ Asymptotes:$\quad y=\displaystyle \pm\frac{b}{a}x\Rightarrow \quad y=\displaystyle \pm\frac{\sqrt{5}}{2}x$ The translations are such that $(x,y)\rightarrow(x',y')$, where $\left\{\begin{array}{ll} x'=x+2 & \text{... shift right}\\ y'=y+2 & \text{... shift up} \end{array}\right.$ New foci:$\quad (\pm 3+2, 0+2)\Rightarrow\quad (5, 2)$ and $(-1,2)$ New vertices:$\quad (\pm 2+2, 0+2)\Rightarrow\quad (4, 2)$ and $(0,2)$ New center:$\quad (0+2,0+20)\quad =(2,2)$ New asymptotes:$\displaystyle \quad y'=\pm\frac{\sqrt{5}}{2}x'$ $y-2=\displaystyle \pm\frac{\sqrt{5}}{2}(x-2)$
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