alussovsky
Member
- Joined
- May 17, 2018
- Messages
- 39
- Gender
- Male
- HSC
- 2019
So from what I've learnt so far, you almost always have to find the general term first before finding out the coefficient of a term in binomial. I understand how to do these for normal ^x )
expansions, but how do you go about finding the general terms of binomial expansions that have more than one bracket? Sorry for the probably incorrect terminology, lol.
For example, how would you go about finding the general term of(1-x)^{15} )
for the coefficient of 
or (1+x)^{11} )
for the coefficient of 
?
For the first, I managed to get to(\binom{15}{k}x^k) )
but I'm not sure how to progress from there to make a single 
and equate that to the required coefficient term. Unless that's the completely wrong way to go about it...? Well anyway, thanks!
For example, how would you go about finding the general term of
For the first, I managed to get to
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