Question

Find the sum and the difference of the following expressions –a–b and a–b

Answer 1

The sum:

`-a-b+a-b=-2b`

The diff:

`-a-b-a+b=-2a`

Hope this helps.

Answer 2

Sum= - 2b and diffrence = - 2a

Explanation:

Since,we have two expressions - a-b and a-b

Sum=(-a-b) +(a-b) =-a-b+a-b=-2a

Since, - a+a=0 and - b-b=-2b

Diffrence =(-a-b) - (a-b) =-a-b-a+b=-2a

Since,-b+b=0 and - a-a=-2a

Hence the sum and difference of the given expression are - 2b and - 2a respectively.