Answer: (p-q+r)  ( p-q+r)

Step-by-step explanation:

(p^2 - 2pq +q^2)-r^2

=> (p-q) ^2 - r^2

it is in the form of (a)^2 - (b)^2

which is (a+b) (a-b)

=> (p-q+r) (p-q-r)

Hope it help you

Please mark as brainliest if you liked the solution