SOLUTION: Find the 3rd term of (7x+2y)^15

Algebra ->  Sequences-and-series -> SOLUTION: Find the 3rd term of (7x+2y)^15      Log On


   

Question 1087575: Find the 3rd term of (7x+2y)^15
Answer by ikleyn(52788) About Me  (Show Source):
You can put this solution on YOUR website!
.
%287x%2B2y%29%5E15 = %287x%29%5E15 + 15%2A%287x%29%5E14%2A%282y%29 + 105%2A%287x%29%5E13%2A%282y%29%5E2 + . . . 


The 3-rd term is  105%2A%287x%29%5E13%2A%282y%29%5E2


105 = C%5B15%5D%5E2 = %2815%2A14%29%2F2 . . .

Solved.