# How do you evaluate #-\frac { 3} { 10} + ( - \frac { 9} { 10} )#?

##### 1 Answer

Jun 14, 2017

#### Explanation:

We first open the brackets. When we do that, remember that the product of one minus and one plus results in a minus.

Now, to make things easier, we put both terms within one set of brackets, but keep the minus sign out. That will make both terms inside positive.

Since both the terms inside the brackets have the same denominator, the numerators can be added directly.

Once again, we open the brackets, keeping in mind that the product of a minus and a plus is a minus.

We can now make this into a mixed fraction.