Answer
$$\left(a-1\right)^2-5$$
Work Step by Step
Completing the square, we obtain:
$$ a^2-2a-4+\left(-1\right)^2-\left(-1\right)^2 \\ \left(a-1\right)^2-4-\left(-1\right)^2 \\ \left(a-1\right)^2-5$$
Functions Modeling Change: A Preparation for Calculus, 5th Edition
by Connally, Eric; Hughes-Hallett, Deborah; Gleason, Andrew M.; Cheifetz, Phil C.
Published by
Wiley
ISBN 10:
1118583191
ISBN 13:
978-1-11858-319-7
Chapter 3 - Quadratic Functions - Exercises for Skills for Completing the Square - Page 138: 5
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