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Mathematics
Problem
For the function
s
(
x
)
=
1
(
1
−
3
x
)
2
s(x)=\dfrac{1}{(1-3x)^{2}}
s
(
x
)
=
(
1
−
3
x
)
2
1
, find the coefficient of
x
4
x^{4}
x
4
in its power series expansion about
x
=
0
x=0
x
=
0
. a)
−
405
-405
−
405
b)
324
324
324
c)
405
405
405
d)
81
81
81
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