Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 11 - Quadratic Functions and Equations - 11.6 Quadratic Functions and Their Graphs - 11.6 Exercise Set - Page 740: 2

Answer

True statement

Work Step by Step

The equation of a quadratic function is $f\left( x \right)=a{{x}^{2}}+bx+c$, and the graph has symmetry with respect to a vertical line. For the explanation of the statement, let’s consider $f\left( x \right)={{x}^{2}}$: Put $x=1$ in the function, $\begin{align} & f\left( x \right)={{x}^{2}} \\ & f\left( 1 \right)={{\left( 1 \right)}^{2}} \\ & f\left( 1 \right)=1 \\ \end{align}$ Now, put $x=-1$ in the function, $\begin{align} & f\left( x \right)={{x}^{2}} \\ & f\left( -1 \right)={{\left( -1 \right)}^{2}} \\ & f\left( -1 \right)=1 \\ \end{align}$ Since f(1)=f(-1), we see that symmetry exists.
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