Find the 12th term in the expansion (5x+2)^14
I did (14 ncr 11) (5x)^3 (2)^11
364 (125x^3) (2048)
93,184,000x^3. Is that right?
This can be tricky: you can both write
In the first case you obtain , as you did, whereas in the second case you
get , so what's the correct one?
In my opinion, they both are, and this perhaps is the reason why the usually ask what the
coefficient of some power of x is, not what is this or that term.
Tonio