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: 51

Answer

$ \displaystyle \frac{(x-2)^{2}}{3}+\frac{(y-3)^{2}}{2}=1$ New foci:$\quad (3,3)$ and $(1, 3)$ New vertices:$\quad (2\pm\sqrt{3},3)$ New center:$\quad (2,3)$

Work Step by Step

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