-2(p2-2pq+q2)+3(p2+4pq-q2)

-2p²+4pq-2q²+3p²+12pq -3q² 
= (-2+3) p²+ (4+12) pq +(-2-3) q²
=p²+16pq-5q²
Semoga membantu, jadikan jawaban tercerdas

-2(p2-2pq+q2)+3(p2+4pq-q2)
= -2p2 - 4pq - 2q2 + 3p2 + 12pq - 3q2
= -2p2 + 3p2 - 4pq + 12pq - 2q2 - 3q2
= -p4 - 8pq - 5q4