Answer
$81$
Work Step by Step
We have: $b^2-4ac$
Plug in the values:
$5^2-4.2.(-7)$
$=25-(-56)$
$=81$
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 581: 64
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