Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 9 - Quadratic Functions and Equations - 9-5 Completing the Square - Practice and Problem-Solving Exercises - Page 579: 21


vertex: $( 1,-324)$

Work Step by Step

Consider the equation: $y=x^2-2x-323$ ...(1) The standard equation of the parabola is: $y=a(x-h)^2+k$ with vertex$(h,k)$ Consider right side $x^2-2x=323$ To complete the square add $(\frac{b}{2})^2=(\frac{-2}{2})^2=1$. $x^2-2x+1=323+1$ $(x-1)^2=324$ Thus, equation becomes: $y=(x-1)^2-324$ Compare it with the standard form of the parabola, we get vertex: $( 1,-324)$
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