How do I find the two variables a and n?
In the expansion of #(1+ax)^n# the first three terms are 1+(5/3)x + (10/9) #x^2# what is a and what is n?
In the expansion of
1 Answer
Jun 18, 2018
Explanation:
To solve this you need to know the formula for the binomial expansion of
In our situation we only need the first 3 terms:
=
Therefore
or
For this to work properly we notice that a=1/3, since n must be a natural number, therefore n=5
Test:
Our expression, then, is