Precalculus (6th Edition)

Published by Pearson
ISBN 10: 013421742X
ISBN 13: 978-0-13421-742-0

Chapter 10 - Analysis of Variance - Chapter 10 Test Prep - Review Exercises - Page 1000: 3

Answer

$$\eqalign{ & \,{\text{Vertex }}\left( {h,k} \right) \to {\text{Vertex }}\left( {2,5} \right) \cr & \,\,\,\,\,\,\,{\text{Horizontal axis of symmetry}} \cr & \,\,\,\,\,\,\,{\text{Domain: }}\left[ {h,\infty } \right):\left[ {\frac{7}{4},\infty } \right) \cr & \,\,\,\,\,\,\,{\text{Range:}}\left( { - \infty ,\infty } \right) \cr} $$

Work Step by Step

$$\eqalign{ & x = 5{y^2} - 5y + 3 \cr & x - 3 = 5{y^2} - 5y \cr & x - 3 = 5\left( {{y^2} - y} \right) \cr & x - 3 + 5\left( {\frac{1}{4}} \right) = 5\left( {{y^2} - y + \frac{1}{4}} \right) \cr & x - \frac{7}{4} = 5{\left( {y - \frac{1}{2}} \right)^2} \cr & {\left( {y - \frac{1}{2}} \right)^2} = \frac{1}{5}\left( {x - \frac{7}{4}} \right) \cr & {\text{The equation is written in the form }}{\left( {y - k} \right)^2} = 4p\left( {x - h} \right) \cr & {\left( {y - \frac{1}{2}} \right)^2} = \frac{1}{5}\left( {x - \frac{7}{4}} \right) \to k = \frac{1}{2},\,\,\,h = \frac{7}{4} \cr & \cr & {\text{With: }} \cr & \,\,\,\,\,\,\,\,{\text{Vertex }}\left( {h,k} \right) \to {\text{Vertex }}\left( {2,5} \right) \cr & \,\,\,\,\,\,\,{\text{Horizontal axis of symmetry}} \cr & \,\,\,\,\,\,\,{\text{Domain: }}\left[ {h,\infty } \right):\left[ {\frac{7}{4},\infty } \right) \cr & \,\,\,\,\,\,\,{\text{Range:}}\left( { - \infty ,\infty } \right) \cr} $$
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