Find the 2th term of the expansion of (a-b)^4.

The second term of the expansion is .

Solution:

Given expression:

To find the second term of the expansion.

Using Binomial theorem,

Here, a = a and b = –b

Substitute i = 0, we get

Substitute i = 1, we get

Substitute i = 2, we get

Substitute i = 3, we get

Substitute i = 4, we get

Therefore,

Hence the second term of the expansion is .

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