Answer
$4$
Work Step by Step
With $b=-4$, complete the square by adding $\left(\frac{b}{2}\right)^2$:
$\left(\dfrac{b}{2}\right)^2=\left(\dfrac{-4}{2}\right)^2=(-2)^2=4$
Therefore, to complete the square, add $4$ to the given expression.
Algebra 2 Common Core
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133186024
ISBN 13:
978-0-13318-602-4
Chapter 4 - Quadratic Functions and Equations - 4-6 Complete the Square - Lesson Check - Page 237: 5
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