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Derivatives
hard
0:00.0
Find the maximum of
f
(
x
)
=
−
x
2
+
4
x
+
5
f(x) = -x^2 + 4x + 5
f
(
x
)
=
−
x
2
+
4
x
+
5
.
A
9
9
9
B
4
4
4
C
2
2
2
D
5
5
5
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