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TMUA Practice · Paper 2 · Question 2
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f
(
x
)
=
4
x
3
(
x
2
+
5
)
(
2
x
)
,
x
>
0
Which one of the following is equal to
f
′
(
x
)
?
A
8
x
4
9
+
3
40
x
4
1
B
2
9
x
4
5
+
2
5
x
−
4
3
C
8
x
4
9
+
3
40
x
−
4
1
D
13
8
x
4
13
+
8
x
4
5
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