Precalculus (6th Edition) Blitzer

Published by Pearson
ISBN 10: 0-13446-914-3
ISBN 13: 978-0-13446-914-0

Chapter 9 - Section 9.3 - The Parabola - Exercise Set - Page 997: 17



Work Step by Step

Standard form of a parabola is given as: $y^2=4px$ ...(1) Formula to find focus is: $F(p,0)$ and formula to find directrix is: $x=-p$ or, $x+p=0$ As we are given that focus is: $(7,0)$ and directrix is: $x=-7$ or $x+7=0$ Plug all these data in equation (1), we have: $p=7$ Thus, $y^2=4(7)x \implies y^2=28x$
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