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Daniel T. for tutoring lessons in Laguna Niguel CA Over 100 tutoring hours WyzAnt Tutoring Tutor Tutor United States

Daniel T.

Excellence in Chemistry and Math

Laguna Niguel, CA (92677)

Travel Radius 5 miles
Hourly Fee $60.00
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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

Daniel's Answer:

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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