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Mathematics
Amiah Waller
17 March, 11:58
Find the 8th term in the expansion (x^2 - 9) ^9.
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1
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Natalee Stokes
17 March, 12:25
0
-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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