find the coefficient of x raise to 6 in the expansion of 3xsquare -1/3x raise to 9
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Answer:
We have (x
2
−2x)
10
=x
20
(1−
x
2
)
10
and since x
20
multiplies every term in the expansion of (1−
x
2
)
10
, we have in this expansion to seek the coefficient of the term which contains
x
4
1
Hence the required coefficient
10
C
4
(−2)
4
=
1.2.3.4
10.9.8.7
×16=3360
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