Subtract real numbers

Subtract real numbers

 

 Recall that the answer to a subtraction problem is called the difference. Thus, the difference between 6 and 4 is 2. To see how subtraction should be defined, compare the following

two statements.

6 – 4 = 2

6 + (-4) = 2

 

Subtraction

 

For all real numbers a and b,

    a – b = a + (-b).

In words, change the sign of the second number (subtrahend) and add.

 

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