hello i have not done maths in a long time and need some help after a while reading some books and solving a few equations i have got stuck on the binomial expression (1+x)^1/2 i am trying to solve the first 5 terms.

i have expanded it i have no problems with that but my calculations to simplify the longer terms is a bit rusty i no the 4th term of the expression is:

+ (1/2)(1/2-1)(1/2-2)(x)^3 = i think 1/16x^3

3!

i have come up with this answer by looking at lots of examples and reading but i do not know if i am correct as i do not understand how to calculate or simplify the long term once i understand the basics of how a=b i will be able to solve more

please help me thanks olie