Algebra: A Combined Approach (4th Edition)

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

Chapter 11 - Section 11.5 - Quadratic Functions and Their Graphs - Practice - Page 806: 10

Answer

Please see the graph.

Work Step by Step

$f(x) = 2(x+3)^2-4$ $f(x) = 2(x-{-3})^2-4$ The axis of symmetry for a graph of the form $a(x-h)^2+k$ is $x=h$. So, the axis of symmetry for the line above is $x=-3$. The vertex is as follows: $f(x) = 2(x+3)^2-4$ $f(-3) = 2(-3+3)^2-4$ $f(-3) = 2(0)^2-4$ $f(-3) = 2*0-4$ $f(-3)=0-4$ $f(-3)=-4$ $(-3, -4)$ is the vertex. $x=-5$ $f(x) = 2(x+3)^2-4$ $f(-5) = 2(-5+3)^2-4$ $f(-5) = 2(-2)^2-4$ $f(-5)=2*4-4$ $f(-5)=8-4$ $f(-5)=4$ Since we are two units from the axis of symmetry, we also have $(-1, 4)$ as another point on the curve. $x=-4$ $f(x) = 2(x+3)^2-4$ $f(-4) = 2(-4+3)^2-4$ $f(-4) = 2(-1)^2-4$ $f(-4) = 2*1-4$ $f(-4) = 2-4$ $f(-4)=-2$ Since we are one unit from the axis of symmetry, we also have $(-2, -2)$ as another point on the curve.
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