Algebra 2 Common Core

Published by Prentice Hall
ISBN 10: 0133186024
ISBN 13: 978-0-13318-602-4

Chapter 4 - Quadratic Functions and Equations - 4-7 The Quadratic Formula - Practice and Problem-Solving Exercises - Page 246: 66

Answer

$\text{no $x$-intercept}$

Work Step by Step

Using $y=ax^2+bx+c,$ the given equation, \begin{align*} y=7x^2-2x+9 ,\end{align*} has $a= 7 ,$ $b= -2 ,$ and $c= 9 .$ Using the Discriminant Formula which is given by $b^2-4ac,$ the value of the discriminant is \begin{array}{l}\require{cancel} & (-2)^2-4(7)(9) \\&= 4-252 \\&= -248 \end{array} Since the discriminant is less than $0,$ then there is no real solution. With no real solution, then the graph of the given equation has $ \text{no $x$-intercept} .$
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.