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Binomial expansion

IMG_3609.jpg

got a question that's bugging me x100

it's 2b)

i'd appreciate any help :smile:
Reply 1
Avatar for Glib
Glib
13
Expand both the brackets
collect like terms
factorise
Expand the (1+x)^4 then think what differences (1-x)^4 would have
Original post by nitrogenousBase
IMG_3609.jpg

got a question that's bugging me x100

it's 2b)

i'd appreciate any help :smile:


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?
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?
Original post by nitrogenousBase


got a question that's bugging me x100

it's 2b)

i'd appreciate any help :smile:


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.
Reply 6
Avatar for Zacken
Zacken
22
Original post by nitrogenousBase
Is it not essentially the same expansion except with certain terms of negative value?


Indeed!

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