x？ +(p+q)x+pq=x？ +mx+36

Pq=36 is known.

Known:

P and q are positive integers, so:

p= 1，q=36

p=2，q= 18

p=3，q= 12

p=4，q=9

p=6，q=6

(or p, q exchange, does not affect the result)

m=p+q=37，20， 15， 13， 12