Sorry, I didn't see the minus sign. You should use the following formula:
So in the end the term independent of `x` is `(-1)^5((15),(5))3^10 2^5=-5674372704`
Once again I'm sorry for my mistake.
We will use binomial expansion formula:
Therefore we have
We need to find term for which the exponents of both `x` terms are equal so that they can cancel out i.e. we need to find `k` such that
Thus we get our term for `k=5.`
The term independent of `x` is `((15),(5))3^10 2^5=5674372704.`