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lisov135 [29]
3 years ago
12

What is the fifth term of (x-2y)^7

Mathematics
1 answer:
Vladimir79 [104]3 years ago
3 0

Answer:

560x^3y^4.

Step-by-step explanation:

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

We want the fifth term so r = 5 - 1 = 4:

(4 + 1)th term = 7C4 x^(7-4) (-2y)^4

= 35x^3 16y^4

= 560x^3y^4.

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Step-by-step explanation:

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