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b=2
c=-15
Δ=b²-4ac=4-4*1*(-15)=4+60=64
p=-b/2a=-2/2=-1
q=-Δ/4a=-64/4=-16
x1=-b+√Δ/2a=-2+8/2=4/2=2
x2=-b-√Δ/2a=-2-8/2=-10/2=-5
p=-1
q=-16
x1=2
x2=-5
4-(-60)=4+60=64