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# Binomial expansion of 3 terms Watch

1. Write down the expansion of (1+x)^5 in ascending powers of x as far as the term in x^3 . Hence find the first four terms in the expansion of (1+x-x^2)^5 .

i need help for the second part of the question
2. (Original post by Sarah Lols)
Write down the expansion of (1+x)^5 in ascending powers of x as far as the term in x^3 . Hence find the first four terms in the expansion of (1+x-x^2)^5 .

i need help for the second part of the question
As a guess, try replacing the x in the first expansion with x-x^2
3. (Original post by Sarah Lols)
Write down the expansion of (1+x)^5 in ascending powers of x as far as the term in x^3 . Hence find the first four terms in the expansion of (1+x-x^2)^5 .

i need help for the second part of the question
Use the first part

Just put where you had x, expand and simplify
4. Hey guys , that means that I've to let u = x-x^2 right ? Thanks !

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