If the directrix is horizontal, then the parabola opens (horizontally/vertically).

Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter11: Topics From Analytic Geometry
Section11.3: Hyperbolas
Problem 40E
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If the directrix is horizontal, then the parabola opens (horizontally/vertically).

Expert Solution
Step 1

Given:

We must find the missing word in the given sentence.

So, Definition of parabola said:

A parabola is another type of conic section generated by the cross section of a cone intersected by a plane. An equation of the form:

y = ax + bx +c (a ± 0)
Step 2

The above equation is parabola opening upward if a > 0 and opening downward if a < 0.

So, the geometrically definition of parabola is the set of all points in a plane that the equidistant from a fixed line called directrix and a fixed point called the focus.

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