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x²-(2p+2q+2)-(4pq+2p+2q+1)
x²-2p-2q-2-4pq-2p-2q-1
x²-4pq-4p-4q-3
x²-4(pq+p+q)-3
p+q = 5
pq = -1
Sehingga,
p' = 2p+1
q' = 2q+1
Menjadikan persamaan kuadrat baru: