Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 3 - 3.1 - Quadratic Functions and Models - 3.1 Exercises - Page 248: 21

Answer

$f(x)=\left(x-\frac{1}{2}\right)^2+1$ See graph Vertex: $\left(\frac{1}{2},1\right)$ Axis of symmetry: $x=\frac{1}{2}$ No $x$-intercept

Work Step by Step

Finding the quadratic function in standard form $f(x)=a(x-h)^2+k$: $$f(x)=x^2-x+\frac{5}{4}$$ $$f(x)=x^2-x+\left(\frac{1}{2}\right)^2+\frac{5}{4}-\left(\frac{1}{2}\right)^2$$ $$f(x)=x^2-x+\frac{1}{4}+\frac{5}{4}-\frac{1}{4}$$ $$f(x)=\left(x-\frac{1}{2}\right)^2+1$$ The sketch of the graph of the function is as shown. Notice that the vertex is: $$\left(\frac{1}{2},1\right)$$ The axis of symmetry is: $$x=\frac{1}{2}$$ There is no $x$-intercept as $f(x)>0$ for any real $x$.
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