Q. 39 A5.0( 2 Votes )

Find the two middle terms in the expansion of :

(x2 + a2)5

Answer :

For (x2 + a2)5,

a= x2, b= a2 and n=5

As n is odd, there are two middle terms i.e.

I. and II.

General term tr+1 is given by,

I. The first, middle term is

Therefore, for the 3rd middle term, r=2

Therefore, the first middle term is

= 10. a4. x6

II. The second middle term is

Therefore, for the 4th middle term, r=3

Therefore, the second middle term is


= 10. a6. x4

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