Concept explainers
To find : The standard form of the equation of parabola with the given characteristics .

Answer to Problem 34E
Explanation of Solution
Given information: Focus of parabola is at (0,0) and directrix at
Calculation:
The directrix is horizontall line .The focus lies below the directrix .The parabola always curves towards focus and away from directrix. So, this is a right downwards parabola. Therefore, the standard equation of parabola is of form
where ( h,k ) is the position of vertex of parabola and a is distance of focus from vertex.
The vertex lies exactly between the focus and directrix and must be at (0,4),so
h =0 and k =4
Since directrix and focus are 8 units apart. Therefore, vertex and focus are 4 units apart, so
a= 4
Therefore, standard equation of parabola is
Chapter 10 Solutions
EBK PRECALCULUS W/LIMITS
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