(p+1)^2+9=25
p^2+2p+1+9=25
p^2+2p-15=0
D=4+60=64
p1=8, p2=-8
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(p+1)^2+9=25
p^2+2p+1+9=25
p^2+2p-15=0
D=4+60=64
p1=8, p2=-8