# Binomial Expansion

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#1
Hi,

What is part ii asking for?

For part i I have

1 + 2x + 3x^2 + 4x^3 + 20x^4
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#2
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3 months ago
#3
I disagree with your x^4 term (although note it's one term beyond the four requested).

For part (ii) they are asking you to state a general term for x^n, based on the pattern emerging from the first four terms.
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#4
oh yes thank you, got a bit carried away, do you mean like a geometric progression so X^n = x^n-1? given a = 1, r = X?
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3 months ago
#5
(Original post by M.Johnson2111)
oh yes thank you, got a bit carried away, do you mean like a geometric progression so X^n = x^n-1? given a = 1, r = X?
Not really. The term in x^n will be (something)x^n. The "something" will be dependent in some way on the value of n, according to a pattern you have to recognise from the first few terms.
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#6
okay so the number in front of each term increases by one as does the power, n(x^n+1) ?
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3 months ago
#7
(Original post by M.Johnson2111)
okay so the number in front of each term increases by one as does the power, n(x^n+1) ?
Yes, that's the term in x^(n + 1), so the term in x^n is......?
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#8
x^(n-1)
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3 months ago
#9
(Original post by M.Johnson2111)
x^(n-1)
No. the term in x^n will be (something)x^n. You were getting quite close in post #6.
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#10
okay since each term is 1n greater,

(n+1) x^(n+1) ?
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3 months ago
#11
(Original post by M.Johnson2111)
okay since each term is 1n greater,

(n+1) x^(n+1) ?
No. The term in x^n will be (something)x^n, whereas you have written (something)x^(n+1). The mention of the coefficient being one greater than the power is relevant, though.
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#12
oh so (n+1)X^n ?
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3 months ago
#13
(Original post by M.Johnson2111)
oh so (n+1)X^n ?
Yep, that's it.
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#14
thank you, an @guest2005 no im not actually Im trying quite hard to get an A at least in maths at ALevel and im on target so my question for you is "r u dumb blud" ?
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3 months ago
#15
(Original post by M.Johnson2111)
thank you, an @guest2005 no im not actually Im trying quite hard to get an A at least in maths at ALevel and im on target so my question for you is "r u dumb blud" ?
seriously tho, im doing GCSEs rn and i can do that bloddy penchaud.
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#16
haha itd help if you told me the original language
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#17
good for u ?
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3 months ago
#18
(Original post by M.Johnson2111)
good for u ?
ikr dumb ass
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3 months ago
#19
(Original post by M.Johnson2111)
haha itd help if you told me the original language
I'm sure if u can try hard at getting an A u can try hard and figure out the language
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#20
what is ur problem? and who are you, no i cant because i really dont care and I dont think this site is an appropiate place to do whatever youre trying to do
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