Answer
$121$
Work Step by Step
$z^2+22z+c$
Compare it with $az^2+bz+c$, we have $b=18$
For perfect-square trinormal add $(\frac{b}{2})^2$ and Plug $b=22$ to complete the square.
$c=(\frac{22}{2})^2=(11)^2=121$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
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: 8
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