d
3
a
2
−
(
c
+
b
)
d
3
a
2
-
(
c
+
b
)
if
a
=
−
2
a
=
-
2
,
b
=
3
b
=
3
,
c
=
−
12
c
=
-
12
, and
d
=
−
4