Binomial expansion Question: Expand (1+2x-x^2)^5 in ascending powers of x as far as the term containing x^4 (1 Viewer)

[tk8]

All help appreciated with this question: Expand (1+2x-x^2)^5 in ascending powers of x as far as the term containing x^4

 

[TheVuk]

square root then log it and you should be eetswa

 

[yanujw]

Treat it as
Then use the methods you would use for any (1 + x)^n expansion. You may end up having to apply BE multiple times. Hopefully someone can provide a more efficient method.

 

[Drongoski]

Treat it as
Then use the methods you would use for any (1 + x)^n expansion. You may end up having to apply BE multiple times. Hopefully someone can provide a more efficient method.

This seems a sound approach.

 

[Lith_30]

Maybe try and solve the square then expand it



then expand it from here

 

[CM_Tutor]

Treat it as
Then use the methods you would use for any (1 + x)^n expansion. You may end up having to apply BE multiple times. Hopefully someone can provide a more efficient method.

I am very confident that this is the approach that is intended, though there can be more efficient ones, such as the one @Lith_30 suggests