Answer
$2(x-5)^2 + 7$
Work Step by Step
$2x^2 - 20x + 57
= 2(x^2 -10x +5^2) + 57 - (2\times5^2)
= 2(x-5)^2 + 57 - 50
= 2(x-5)^2 + 7$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 3 - Section 3.1 - Quadratic Functions and Models - 3.1 Exercises - Page 252: 21
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