Question

What is the constant term in binomial expansion?

Answer 1

Constant term in binomial expansion is that general term that does not contain variable x.

Answer 2

We can see that the general term becomes constant when the exponent of variable x is 0 . Therefore, the condition for the constant term is: n−2k=0⇒ k=n2 . In other words, in this case, the constant term is the middle one ( k=n2 ).