Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 11 - Section 11.6 - Further Graphing of Quadratic Functions - Vocabulary and Readiness Check - Page 819: 3

Answer

no x-intercepts, 1 y-intercept

Work Step by Step

We are told the parabola opens up and has its vertex in quadrant I. With the vertex in quadrant I, we know either the $x$ value of the vertex is greater than zero or the $y$ value of the vertex is greater than zero (or both are true). Since at least one coordinate of the vertex is positive, and the parabola opens up, the graph of the parabola doesn't cross the x-axis. Since the graph doesn't cross the x-axis, there are no x-intercepts. Since at least one coordinate of the vertex is positive, and the parabola opens up, the graph of the parabola does cross the y-axis. Since the graph does cross the y-axis, there is one x-intercept.
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