Evaluate:
b
2
−
4
a
c
\displaystyle {b}^{{2}}-{4}{a}{c}
b
2
−
4
a
c
where
a
=
−
1
\displaystyle {a}=-{1}
a
=
−
1
,
b
=
2
\displaystyle {b}={2}
b
=
2
and
c
=
4
\displaystyle {c}={4}
c
=
4
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