Answer
Graph c)
Work Step by Step
A quadratic equation that has discriminant zero has only one real solution (with multiplicity $2$). Its graph is a parabola that touches the $x$-axis in one point.
The graph that fits is Graph c).
Intermediate Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-894-7
ISBN 13:
978-0-13417-894-3
Chapter 8 - Section 8.2 - The Quadratic Formula - Exercise Set - Page 608: 66
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