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# Binomial expansion watch

1. I can't seem to find any examples in any of the textbooks I have on how to answer these types of questions (ones in bold):

1.
a) Show that
b) Find the values of x for which

Or "find the independent term of x in the expansion..." type of questions

Does anyone know where I could find some examples/provide some examples or any youtube videos that may help?

Thanks a lot!
2. b) You need to make . Can you see why?
3. (Original post by Mr M)
b) You need to make . Can you see why?

Nope sorry
4. (Original post by IgorYakov)
Nope sorry
Because that would make the bit from the first line that you do not want "go away"
5. (Original post by IgorYakov)
Nope sorry
I'm not having that. Stare at the question a bit longer and make use of the information I gave you.
6. (Original post by TenOfThem)
Because that would make the bit from the first line that you do not want "go away"
Oh right, how do I make that? because If I put a value for X wouldn't they turn into numbers without x?
7. (Original post by Mr M)
I'm not having that. Stare at the question a bit longer and make use of the information I gave you.

I thought that if we were supposed to cancel it we would need to make so I wasn't too sure
8. (Original post by IgorYakov)
I thought that if we were supposed to cancel it we would need to make so I wasn't too sure
I'm not really sure what you are saying.

You have been asked to find out which values of x make the following true:

This means

You can factorise this:

Which leads to two solutions.
9. (Original post by Mr M)
I'm not really sure what you are saying.

You have been asked to find out which values of x make the following true:

This means

You can factorise this:

Which leads to two solutions.
Aah right! I didn't think about that properly, sorry for that and thanks!!
10. (Original post by IgorYakov)
Aah right! I didn't think about that properly, sorry for that and thanks!!
No problem.
11. (Original post by Mr M)
No problem.

Sorry last thing, that would give the solutions x = 0 and x = -1/2 right? the book says x = 0 and x = 1/2 not negative, is this right?
12. (Original post by IgorYakov)
Sorry last thing, that would give the solutions x = 0 and x = -1/2 right? the book says x = 0 and x = 1/2 not negative, is this right?
Try substituting the answer you are unsure about into the two expressions. Does it work?
13. (Original post by Mr M)
Try substituting the answer you are unsure about into the two expressions. Does it work?

Aah yeah, so it is -1/2 thanks!

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