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: 56

Answer

$ \displaystyle \frac{(y-3)^{2}}{3}-\frac{(x-1)^{2}}{1}=1$ New foci:$\quad$ $(1, 5)$ and $(1, 1)$ New vertices:$\quad$ $(1, 3\pm\sqrt{3})$ New center:$\quad (1,3)$ New asymptotes:$\quad y-3=\pm\sqrt{3(}x-1)$

Work Step by Step

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