Question

What is the coefficient of x 9y 4 in the expansion of (2x + 3y) 13?

Answer 1

Answer:

  29,652,480

Step-by-step explanation:

The term of interest is ...

  (13C9)(2x)^9·(3y)^4 = 715·512·81·x^9·y^4 = 29,652,480·x^9·y^4

The coefficient is 29,652,480.