Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 8 - Test - Page 533: 20

Answer

Vertex: $(2,1)$ x-intercept: none y-intercept: $(0,9)$

Work Step by Step

$F(x) =2x^2-8x+9$ $a=2$, $b=-8$, $c=9$ The axis of symmetry is $x=-b/2a$, and the vertex of the graph is on the axis of symmetry. $x=-b/2a$ $x=-(-8)/2*2$ $x=8/4$ $x=2$ $F(x) =2x^2-8x+9$ $F(2)=2*2^2-8*2+9$ $F(2)=2*4-16+9$ $F(2)=8-16+9$ $F(2)=1$ $(2, 1)$ is the vertex. Since the vertex is above the x-axis and opens upward (due to the positive coefficient on $x^2$), there are no x-intercepts. $x=0$ $F(x) =2x^2-8x+9$ $F(0) =2*0^2-8*0+9$ $F(0)=2*0-0+9$ $F(0)=0+9$ $F(0)=9$ $(0,9)$ is the y-intercept. Vertex: $(2,1)$ x-intercept: none y-intercept: $(0,9)$
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