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Alondra Blackburn
Mathematics
24 May, 19:21
Find the 4th term of (x+5) ^7
A. 35x^4
B. 4375x^4
C. 21,875x^3
D. 625x^4
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2
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Maximillian Tucker
24 May, 19:23
0
B. 4375x^4
Step-by-step explanation:
Firstly, you can just multiply it and look at the fourth term or use the binomial theorem. Either way it's B.
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Heaven Mason
24 May, 19:38
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4375x^4.
Step-by-step explanation:
There is a useful formula for answering these type of questions. It is:
(r + 1) th term of (x + a) ^n = nCr x^ (n-r) a^r.
4th term = (3 + 1) th term of (x + 5) ^7
= 7C3 x^ (7-3) 5^3
= 35 x^4 * 125
= 4375x^4.
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» Find the 4th term of (x+5) ^7 A. 35x^4 B. 4375x^4 C. 21,875x^3 D. 625x^4
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