How to Verify the 5th Term of the Binomial Expansion of (3-2/x)^9?

[donniemateno]

hi there I am abit stuck here. i got a q saying :
in binomial expansion of (3-2/x)^9 find the 5th term using the general term of the binomial expansion and check your answer

(3-2/x)^9

used formula

=N!/(n-r)!r! * A^(n-r) * b ^ r

r= 4
a= 3
b= - 2/x
n=9

got a answer of -489888/x^4

How do i go about checking my answer??

 

[Mark44]

My answer is like yours, but without the negative sign.