Question

The 2nd, 3rd and 4th terms in the expansion of (x + a)n are 240, 720 and 1080
respectively. Find the values of x, a and n
(x+a)whole ki power n h​

Answer 1

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We should take note that the the first term of a binomial expansion is 0.

We begin counting from 0 and not 1.

For instance the second term is

(x + a) ¹

The third term :

(x + a) ²

Fourth term:

(x + a) ³

With this information we can do the calculations.

When we calculate this we get :

a = 3, x = 2 and n=5.

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Answer 2

Answer:

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Step-by-step explanation:

here is photo