Question

(3) p+q+r,p-q+r,p-q-r, -p+q+r ​

Answer 1

Answer:

2p + 2r

Explanation:

This is how i do it

First i convert the minuses like this : (Look at the question and see the difference)

p + q + r + p +(0q) + r + p +(-q) + (-r) + (-p) +q + r

Now we can easily cut al the same minus and plus

(This is how it is the concept

When we have  This  equation for eg: (-p) + p + r + r + (-r)

we can take out the same number / variable  like (-p) and +p can be taken out as well as (-r) and r because every number minised by its negative form is always zero

So now what is left r so answer is r in my example

No similarly when we take your question

we take out all of the common variables with minus and plus and we will have two p's and r's left . So when add all of them together we will get 2p + 2r

And that's the answer

If you didn't get it I will explain it to you  again!