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cntoh soal:
persamaan kuadrat x^2+(p-2)x+4=0
mempunyai akar kembar nilai p=
a=1
b=(p-1)
c=4
D=(p-1)^2-4x1x4
p^2-4p+4-6=0
p^2-4p-12=0
(p-6)(p+2)
p=6 atau p=-2