emilynoelrose emilynoelrose

25-07-2017
Mathematics

contestada

What is the fifth term in the expansion of (3x - 3y)7?
__ x3y4

Respuesta :

Аноним Аноним

25-07-2017

(r+1)th term of (a +x)^n = nCr a^(n-r)x^r

so 5th term of (3x - 3y)^7 = 7C4 * (3x)^(7-4) (-3y)^4 (NOTE r = 4)

= 35 * 27x^3 * 81y^4

= 76545 x^4y^3

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faithallums13 faithallums13

24-01-2021

Answer:

76545

Step-by-step explanation:

got it write on edge :)

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