Hi.(adsbygoogle = window.adsbygoogle || []).push({});

I'm completely stuck on the following question, and have no idea how to even start it.

Any help would be really appreciated.

The first four terms, in ascending powers of x, of the binomial expansion of (1 + kx)^n are

1 + Ax + Bx^2 + Bx^3 + ...,

where k is a positive constant and A,B and n are positive intgers.

(a) By considering the coefficients of x^2 and x^3, show that 3 = (n - 2)k.

Thank you.

Cathy

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Core 2 help

**Physics Forums | Science Articles, Homework Help, Discussion**