In Problems 1-3, find the coordinates of the focus and the equation of the directrix for each

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In Problems 1-3, find the coordinates of the focus and the equation of the directrix for each parabola. Make a sketch showing the parabola, its focus, and its directrix.
1. y2 = 4
2. y2 = -12x
3. x2 = -12y
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Calculus

ISBN: 978-0131429246

9th edition

Authors: Dale Varberg, Edwin J. Purcell, Steven E. Rigdon

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