Hi
I am trying to establish how the 1/4(x) becomes 1/10 in the expansion at the bottom
thanks
Alright, think of binomial expansions like this. Let k be the counter, and n your exponent in $\displaystyle (x+y)^n$ x = 2 and y = (1/4)x
When k = 0, then $\displaystyle x^(n-k) y^k = x^n$, specifically $\displaystyle 2^9$. The coefficient is 1.
and so on. (The first three numbers on the 10th line are 1, 9, 37)