Differentiate
f
(
y
)
=
5
−
4
y
+
7
\displaystyle {f{{\left({y}\right)}}}={5}^{{-{4}{y}+{7}}}
f
(
y
)
=
5
−
4
y
+
7
f
′
(
y
)
=
\displaystyle {f}'{\left({y}\right)}=
f
′
(
y
)
=
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