You are Here: Home >< Maths

# C2 binomial expansion help?!? watch

1. when (1+ax)^n is expanded in ascending powers of x the first three terms are 1-28x+294x^2. find a and n
2. (Original post by ramshahk)
when (1+ax)^n is expanded in ascending powers of x the first three terms are 1-28x+294x^2. find a and n
What have you tried so far? You have two unknown variables to find so see if you can set up a couple of simultaneous equations.

### Related university courses

TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
Updated: January 13, 2017
Today on TSR

### Summer Bucket List is Back!

Start yours and you could win £150!

Poll
Useful resources

### Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

### How to use LaTex

Writing equations the easy way

### Study habits of A* students

Top tips from students who have already aced their exams