If
f
(
x
)
=
−
2
x
2
+
4
x
+
3
\displaystyle {f{{\left({x}\right)}}}=-{2}{x}^{{2}}+{4}{x}+{3}
f
(
x
)
=
−
2
x
2
+
4
x
+
3
, find the instantaneous rate of change of
f
(
x
)
\displaystyle {f{{\left({x}\right)}}}
f
(
x
)
at
x
=
3.
\displaystyle {x}={3}.
x
=
3
.
Answer =
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