(ii) (p+q)²- (p - q)²+ p²q²
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Step-by-step explanation:
(p+q)²= p²+2pq+q²
(p-q)²= p²-2pq+q²
(p+q)²- (p - q)²+ p²q²=p²+2pq+q²-(p²-2pq+q²)+p² q²
=p²+2pq+q²-p²+2pq-q²+p² q²
=4pq+p² q²
=pq(4+pq)
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