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

User Quirzo
by
8.3k points

1 Answer

4 votes

Answer:

29,652,480

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.

User ZhongYu
by
7.6k points
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