Evaluate
b
2
−
4
a
c
\displaystyle {b}^{{2}}-{4}{a}{c}
b
2
−
4
a
c
for
a
=
−
6
\displaystyle {a}=-{6}
a
=
−
6
,
b
=
−
1
\displaystyle {b}=-{1}
b
=
−
1
, and
c
=
7
\displaystyle {c}={7}
c
=
7
.
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