find the difference

Question

6 - (-9) = ?

Answer 1

The difference between 6 and -9 is 15.

To see why, you can change the problem to addition:

6 + 9 = 15

When you subtract a negative number, it's the same as adding the opposite (positive) number. So, -(-9) becomes +9.

Then you can write the problem as:

6 + 9 = 15