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: 58

Answer

$2\text{ $x$-intercepts}$

Work Step by Step

Using $y=ax^2+bx+c,$ the given equation, \begin{align*} y=-2x^2+3x-1 ,\end{align*} has $a= -2 ,$ $b= 3 ,$ and $c= -1 $ Using the Discriminant Formula which is given by $b^2-4ac,$ the value of the discriminant is \begin{array}{l}\require{cancel} & 3^2-4(-2)(-1) \\&= 9-8 \\&= 1 \end{array} Since the discriminant is greater than $0,$ then there are $ 2 $ real solutions. With $ 2 $ real solutions, then the graph of the given equation has $ 2\text{ $x$-intercepts} .$
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