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## Excellence in Chemistry and Math

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# Daniel's Responses in WyzAnt Answers

#### how do I calculate intergers with variables in parentheses

How do I calculate the following:

13 - (-14) =

+ more- less
Asked by Tyianna from Antioch, TN
00

In this problem, the parentheses do not denote an order of operation--they are merely there to distinguish the minus sign from the negative sign. Anytime you are subtracting, think of "adding the opposite." The opposite of a positive number is a negative number, and the opposite of a negative number is a positive number.

So basic subtraction can be thought of like this:
Problem:           4 - 3 =
Now, change the subtraction symbol to addition ("adding") and change the positive 3 to a negative 3 (the opposite of positive 3 is negative 3)
So we have:     4 + (-3) =
= 1

Another example:

10 - (-2) =

Remember, whenever you see subtraction think, "add the opposite". What is the opposite of -2? That should be +2. So...

10 + (+2) =

= 12

Notice in this problem there are two negative numbers:

-10 - (-7) =

Let's "add the opposite" for this problem...

-10 + (+7) =

= -3

For your problem, the work looks like this:

13 - (-14) =

13 + (+14) =

= 27

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