1. What happened when you had a negative plus a negative, (-a) + (-b)? I
2. What happened when you had a positive plus a negative, a + (-b)?
***Is this the same as a positive minus a positive, a - b?
3. What happened when you had a positive minus a negative, a - (-b)?
4. What happened when you had a negative minus a negative, (-a) - (-b)?

See Explanation

Step-by-step explanation:

1.

What happens when negative adds to negative; e.g (-a) + (-b)

First, we need to simplify the expression

Open the brackets

Factorize

So, what happens is that: the two numbers are added together and the result is negated;

E.g.

2.

What happens when positive is added to negative; e.g. a + (-b)

First, we need to simplify the expression

Open the brackets

So, what happens is that: the negative number is subtracted from the positive number

And Yes; is the same as (As shown above)

E.g.

3.

What happens when to positive minus a negative; e.g. a - (-b)

First, we need to simplify the expression

Open the brackets

So, what happens is that; the two numbers are added together.

E.g.

4.

What happens when negative minus a negative; e.g. (-a) - (-b)

First, we need to simplify the expression

Open the brackets

Reorder

So, what happens is that; the first number is subtracted from the second.

E.g.

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