## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$y^8$
The $r+1$ th term in the binomial expansion of $(x+y)^n$ is: $\binom{n}{r}x^{n-r}y^r$ Here $y$ becomes $-y$, $n=8$: The 9th term. $r+1=9$ $r=8$ $\binom{8}{8}x^{8-8}(-y)^8=y^8$