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a>0
D<0
daerah [1]
a>0
p+3>0
p>-3
daerah[2]
D<0
b^2-4ac<0
p^2-4(p+3)(1)<0
p^2-4p-12<0
(p-6)(p+2)<0
dicari nilai yang memenuhi antara p=-2 dan p=6
dengan coba-coba didapat
-2<p<6
iriskan daerah [1] dan [2] didapat
-2<p<6