Question

(p−q)×(p+q)+(q−r)×(q+r)​

Answer 1

Answer:

p^2 - r^2

Step-by-step explanation:

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

= p^2 - q^2 - pq + pq + q^2 - r^2 - qr + qr

= p^2 - r^2