When do I use T_(r+1) = nCr·a^(n−r)·b^r in Binomial Theorem, and what does it mean?
the general (r+1)th term of (a+b)^n.
T_(r+1) = nCr·a^(n−r)·b^r — the general (r+1)th term of (a+b)^n. Use it when: 0 ≤ r ≤ n. Always check the condition holds before plugging in numbers.
Key point
T_(r+1) = nCr·a^(n−r)·b^r
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