What is the meaning of constant term in binomial I'd like to give you an example. Thank you
Take binomial (a + BX) ^ n, (a, B are non-zero constants) as an example: (a + BX) ^ n = C (n, 0) · (a ^ n) · (BX) ^ 0 + C (n, 1) · a ^ (n-1) · (BX) ^ 1 + +C(n,r)·a^(n-r)·(bx)^r+… +C (n, n) · a ^ 0 · (BX) ^ n (1) constant term refers to the term whose exponent of variable x is 0