Question

1. simplify combining like terms
1. p-(p-q)-q-(q-p)

Answer 1

QUESTION:
simplify combining like terms
=> p-(p-q)-q-(q-p)

ANSWER:

Like terms are those terms which have same variable and powers.

Unlike terms are those which do not have the same variables and powers .

p-(p-q)-q-(q-p)

Here p and p & q and q are like terms because they have same variables

But p and q are unlike terms because they have different variables.

✒So,coming to your question

p-(p-q)-q-(q-p)

Open the brackets .

Remember:when the bracket opens the side inside the bracket also changes .

So,

p-p+q-q-q+p

$\cancel{p-p}$+$\cancel{q-q}$-q+p

-q+p is the answer

$\boxed{\boxed{\underline{\underline{-q+p}}}}$