The answer is basically negative. Negative numbers are numbers that are before 0. You will see negative numbers like in these examples.
Example 1: $$-{\mathtt{1}}$$
Example 2: $$\left(-{\mathtt{1}}\right)$$
If you want to add, use the next example.
Example 3: HINT: Always use this method when you add negative numbers.
$$(-1)+(-7)$$
Then, you just ignore the negative symbols (-).
So, it is like adding 1 and 7.
$${\mathtt{1}}{\mathtt{\,\small\textbf+\,}}{\mathtt{7}} = {\mathtt{8}}$$
Now, just put the negative symbol before the 8.
$$-{\mathtt{8}}$$
Now, you can write the answer.
$$\mbox{Answer:\;-8}$$
So, $$-{\mathtt{8}}$$ Is the answer.
For more information, go to the following link:
http://www.mathsisfun.com/positive-negative-integers.html
This will help you.
Hope it helps!