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How do you do binomial expansion when n is the power (exponent)

I have seen questions like these on practice papers and I only know how to do, the first 2 terms, but how will be able to do the rest?

I will present this question as an example:
Write down the first four terms of the binomial expansion, in ascending powers of x, of (1 + ax)^n, where n > 2.
Here's a handy video : https://www.khanacademy.org/math/algebra2/polynomial-functions/binomial-theorem/v/binomial-theorem

For the terms, using the choose formula (nCr), you can find the terms in terms of n, using the formula dicussed in the video.

Ask if there are any questions
Original post by KatheO11
I have seen questions like these on practice papers and I only know how to do, the first 2 terms, but how will be able to do the rest?

I will present this question as an example:
Write down the first four terms of the binomial expansion, in ascending powers of x, of (1 + ax)^n, where n > 2.


Are you familiar with binomial coefficients? If not, see http://www.purplemath.com/modules/binomial.htm for a full explanation.
Original post by ayyy2
subtract the first two terms from the series or whatever it starts at


This is incoherent and irrelevant to the OP's question.

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