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Mathematics
Problem
Let
r
(
x
)
=
x
3
+
q
(
x
)
r(x)=x^{3}+q(x)
r
(
x
)
=
x
3
+
q
(
x
)
and
r
′
(
x
)
=
7
x
2
r'(x)=7x^{2}
r
′
(
x
)
=
7
x
2
. Which of the following is
q
′
(
x
)
q'(x)
q
′
(
x
)
? a)
10
x
2
10x^{2}
10
x
2
b)
7
x
2
7x^{2}
7
x
2
c)
4
x
2
4x^{2}
4
x
2
d)
3
x
2
3x^{2}
3
x
2
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