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: 31

Answer

$y ^2 = 4x$

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. (Definition, p.695) . The focus is at $(h, k + p) or (k+p,h)$, respectively. So let us plug in our given points. The parabola is laterally oriented, since the focus is to the right of the vertex. The focus is $(1,0)$ and the vertex is $(0,0)$. Thus, $h=0$ and $k=0$ and $p=1$. Thus the equation is $(y -0)^2 = 4(1)(x -0)$ or $y ^2 = 4x$.
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