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Mathematics
Problem
The derivative of a function on the interval
(
2
,
5
)
(2,5)
(
2
,
5
)
is given by
f
′
(
x
)
=
4
x
−
k
f'(x)=4x-k
f
′
(
x
)
=
4
x
−
k
. The function will be strictly increasing on
(
2
,
5
)
(2,5)
(
2
,
5
)
when a)
k
>
8
k>8
k
>
8
b)
k
<
20
k<20
k
<
20
c)
k
<
8
k<8
k
<
8
d)
k
=
8
k=8
k
=
8
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