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: 26

Answer

See explanation

Work Step by Step

Finding the quadratic function in standard form: $$f(x)=2x^2-x+1$$ $$f(x)=2\left(x^2-\frac{1}{2}x\right)+1$$ $$f(x)=2\left(x^2-\frac{1}{2}x+\left(\frac{-\frac{1}{2}}{2}\right)^2\right)+1-2\left(\frac{-\frac{1}{2}}{2}\right)^2$$ $$f(x)=2\left(x^2-\frac{1}{2}x+\frac{1}{16}\right)+1-\frac{1}{8}$$ $$f(x)=2\left(x-\frac{1}{4}\right)^2+\frac{7}{8}$$ The sketch of the graph of the function is as shown. The vertex is: $$\left(\frac{1}{4},\frac{7}{8}\right)$$ The axis of symmetry is: $$x=\frac{1}{4}$$ There is no $x$-intercept.
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