What is the fourth term in the binomial expansion of (2x – y) 7?

And replacing we got:

And then the final term would be:

Step-by-step explanation:

For this case we have the following expression:

And we can use the binomial theorem given by:

And for this case we want to find the fourth term and using the formula we have:

And replacing we got:

And then the final term would be: