## Precalculus (6th Edition) Blitzer

The given expression $\sum\limits_{i=1}^{8}{(i+7)}$ shows $(i+7)$ is the single term, whereas the expression $\sum\limits_{i=1}^{8}{i+7}$ indicates that $i$ is the single term and $7$ is the addition to the whole sequence. Hence $\sum\limits_{i=1}^{8}{(i+7)}=92$ Whereas $\sum\limits_{i=1}^{8}{i+7}=43$