Answer
$c=16$.
Work Step by Step
Comparing $x^{2}-8x+c$ with $x^{2}+bx+c$, we see that $b=-8$.
The value of $c$ so that it completes the square is
$c=(\frac{b}{2})^{2}=(\frac{-8}{2})^{2}=16$
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 9 - Solving Quadratic Equations - 9.4 - Solving Quadratic Equations by Completing the Square - Exercises - Page 511: 5
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