Question

FACTORISE :- (p+q-r)^2-(p-q+r)^2
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Answer 1

Answer:

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

= {(p+q-r) + (p-q+r)} {(p+q-r) - (p-q+r)}

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

= 2p × 2q

= 4pq (ans.)