jameskhonbrown jameskhonbrown

12-07-2019
Mathematics

contestada

find the 8th term in the expansion (x^2 - 9)^9.

Respuesta :

Аноним Аноним

12-07-2019

Answer:

-172,186,884x^4.

Step-by-step explanation:

The (r + 1)th term of (a + b)^n = nCr a^(n-r) b^r.

So the 8th term of (x^2 - 9)^9 =

(7 + 1)th term

= 9C7 (x^2)^(9-7) (-9)^7

= 36 * (x^2)^2 * -4782969

= -172186884x^4.

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