(p+2q)(2p-q)-(p+q)(p-q)
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(p+2q)(2p-q)-(p+q)(p-q)(p+2q)(2p-q)-(p+q)(p-q)(p+2q)(2p-q)-(p+q)(p-q)=(2p²-pq+4pq-2q²)-(p&
(p+2q)(2p-q)-(p+q)(p-q)
(p+2q)(2p-q)-(p+q)(p-q)
(p+2q)(2p-q)-(p+q)(p-q)
=(2p²-pq+4pq-2q²)-(p²-q²)
=p²+3pq-q²
(p+2q)(2p-q)-(p+q)(p-q)
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