Multivariable Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 0-53849-787-4
ISBN 13: 978-0-53849-787-9

Chapter 10 - Parametric Equations and Polar Coordinates - 10.5 Exercises - Page 700: 10

Answer

Equation of parabola is $(x -2)^2 = 2(y +2)$. Focus: $(2,-\frac{3}{2})$ Directrix : $y=-\frac{5}{2}$

Work Step by Step

If a parabola is oriented upwards, the equation of the parabola is, $(x -h)^2 = 4p(y - k)$. However, if a parabola is oriented laterally, the equation of the parabola is, $(y -h)^2 = 4p(x - k)$. In the equation, the vertex of the parabola is at $(h, k)\ or\ (k,h)$ respectively. The focus is at $(h, k + p)\ or\ (k+p,h)$, respectively. So let us plug in our given points. Vertex: $(2,-2)$ Hence, $p=\frac{1}{2}$ Equation of parabola is $(x -2)^2 = 2(y +2)$. Focus: $(2,-\frac{3}{2})$ Directrix : $y=-\frac{5}{2}$
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