Question

Write the first four terms in the expansion of: (x + y)^8

Answer 1

Given:

$(x+y)^8$

We will write the first four terms of the expansion.

the general rule of the expansion is as follows:

$(x+y)^n=x^n+n*x^{n-1}*y+...+nCr*x^{n-r}*y^r+...+y^n$

So, the answer will be, the first four terms are:

$x^8+8x^7y+28x^6y^2+56x^5y^3$