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# Binomial expansion

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1. got a question that's bugging me x100

it's 2b)

i'd appreciate any help
2. Expand both the brackets
collect like terms
factorise
3. Expand the (1+x)^4 then think what differences (1-x)^4 would have
4. (Original post by nitrogenousBase)

got a question that's bugging me x100

it's 2b)

i'd appreciate any help
You can save yourself a lot of work by using 2a.

So what is the link between the expansiom of (1+x) and (1-x), without calculating it like in 2a?
5. (Original post by SeanFM)
You can save yourself a lot of work by using 2a.

So what is the link between the expansiom of (1+x) and (1-x), without calculating it like in 2a?
Is it not essentially the same expansion except with certain terms of negative value?
6. (Original post by nitrogenousBase)

got a question that's bugging me x100

it's 2b)

i'd appreciate any help
(Original post by SeanFM)
You can save yourself a lot of work by using 2a.

So what is the link between the expansiom of (1+x) and (1-x), without calculating it like in 2a?
Difference of two squares cleans it up pretty quickly.
7. (Original post by nitrogenousBase)
Is it not essentially the same expansion except with certain terms of negative value?
Indeed!

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