Explanation:
When 2 negative numbers subtract.
Example:
-4 - (-5) = 1
Rule: When a negative number is subtracted from a negative number, they're added and the second negative number changes to a positive.
Now:
-4 + 5 = 1.
When 2 negative numbers multiply.
Example:
-3 x (-6) = 18
Rule: When two negative numbers multiply, the product always remains positive.
Represented as:
3 x 6 = 18.
When 2 negative numbers divide.
Example:
-81 / -9 = 9
Rule: When two negative numbers divide, the quotient always remains positive.
Represented as:
81 / 9 = 9
Note:
Receiving a positive-sum is impossible, you can't add two negative numbers to receive a positive sum.