###### Example 1.1.5 Add Two Negative Numbers

If you needed to add \(-18\) and \(-7\text{,}\) note that both are negative. Maybe you have this expression in front of you:

\begin{equation*}
-18+-7
\end{equation*}

but that “plus minus” is awkward, and in this book you are more likely to have this expression:

\begin{equation*}
-18+(-7)
\end{equation*}

with extra parentheses. (How many subtraction signs do you see? How many negative signs?)

Since *both* our terms are *negative*, we can add \(18\) and \(7\) to get \(25\) and immediately realize that our final result should be negative. So our result is \(-25\text{:}\)

\begin{equation*}
-18+(-7)=-25
\end{equation*}