Equations of parabolas Find the equation of the parabola with vertex(0, 0) that opens downward and passes through the point (2, -3).

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter7: Conic Sections
Section7.1: Parabolas
Problem 58E
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Equations of parabolas Find the equation of the parabola with vertex
(0, 0) that opens downward and passes through the point (2, -3).

Expert Solution
Step 1

Given:

Vertex = (0, 0)  and the point = (2, -3)

To find:

Equation of parabola with given vertex and the point.

Step 2

The equation of parabola with vertex (h, k) and the point (x, y) can be written as,

y = a x - h2 + k

Here,

h, k = 0, 0x, y = 2, -3

Plugging the values of  h and k,

 y = a x - 02 + 0 y = a x2                            ...(1)

Now to find the value of "a"

Plug the values of x and y,

 -3 = a·22 -3 = 4a    a  = -34 

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