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p + q = -m/2
pq = -(m+1)/2
p²q + pq² = 3
pq(p + q) = 3
-(m+1)/2 . (-m/2) = 3
m² + m =12
m² + m - 12 = 0
(m+4)(m-3)=0
m = -4 V m = 3