If
f
(
x
)
=
3
+
7
x
−
4
x
2
\displaystyle {f{{\left({x}\right)}}}={3}+{7}{x}-{4}{x}^{{2}}
f
(
x
)
=
3
+
7
x
−
4
x
2
, find
f
′
(
−
5
)
\displaystyle {f}'{\left(-{5}\right)}
f
′
(
−
5
)
.
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\displaystyle
Enter your answer as a number (like 5, -3, 2.2172) or as a calculation (like 5/3, 2^3, 5+4)
Enter DNE for Does Not Exist, oo for Infinity