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21-01-2019
Mathematics

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Find the 4th term of the expansion of (2a-b)^7

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Аноним Аноним

21-01-2019

Answer:

-560a^4b^3 .

Step-by-step explanation:

For a binomial expansion :

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

So the 4th term of (2a - b)^7

= (3 + 1)th term = 7C3 (2a)^(7-3) (-b)^3

= 35 * 16a^4* -b^3

= -560a^4b^3 (answer).

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