Answer
$81$
Work Step by Step
Given: $a=2,b=5,c=-7$
Plug in $b^2-4ac$ to get the result.
$b^2-4ac=(5)^2-4(2)(-7)$
$=25+56$
$=81$
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 9 - Quadratic Functions and Equations - 9-5 Completing the Square - Mixed Review - Page 566: 64
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