fredjack fredjack

03-12-2018
Mathematics

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find the 4th term of (x-y)12

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Аноним Аноним

03-12-2018

Answer:

-66 x^9 y^3

Step-by-step explanation:

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

so the 4th term of (x - y)^12

= 12C2 x^(12-3) (-y)^3

= 66 x^9 (-y)^3

= -66 x^9 y^3 (answer)

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