Question

simplify
(p+q-r) (p-q-r)​

Answer 1

Answer:

p²-q²+r²-2pr

Step-by-step explanation:

(p+q-r) (p-q-r)​

= p(p-q-r)​ + q(p-q-r)​ -r(p-q-r)​

= p²-pq-pr+pq-q²-qr-pr+qr+r²

= p²-q²+r²-2pr