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Kelas:VIII SMP
Pembahasan:
Jika y=0, faktorkan
(-x+3)(x+1) 》x=3 atau x=-1
jadi (3,0) (-1,0)
jika x=0
y=3 maka (0,3)
cari titik puncak x=-b/2a
y=D/-4a
buat grafik