Factor the Expression: Finding Common Terms in 9a+8a

We start with the expression $9a+8a$.

First, we notice that both terms share a common factor of $a$.

So, we factor out$a$ from each term:

$9a=a\cdot9$ and $8a = a\cdot 8$.

This allows us to rewrite the expression as $a(9+8)$.

Thus, the factored form is $a\left(9+8\right)$.