5.
The expansion of 2m(3mº-4n+7) is
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(34(n−r))!(34(2n+r))!4n!
The (k+1)th term of the given expression is
Tk+1=4nCkx(4n−k)(x21)k
We know the coefficient of x is 4r, so, 4n−k−2k=4r
k=34(n−r)
The (k+1)th term will be,
4nC34(n−r)(x)(4n−34(n−r))(x21)34(n−r)
The coeffecient will be 4nC34(n−r)
That is,
=
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