Answer
See below.
Work Step by Step
A function that opens down and has only one x-intercept is $-x^2$, which has its $y$-intercept at $(0,0)$. Everyone came up with functions in the form of $-k(x+b)^2$ where $k,b$ where different constants.
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 4 - Section 4.3 - Quadratic Functions and Their Properties - 4.3 Assess Your Understanding - Page 301: 94
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