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y = a(x-x1)(x-x2)
3 = a(0-1)(0-3)
3 = a(-1)(-3)
3 = 3a
a = 3/3
a = 1
Jadi persamaan kuadratnya :
y = a (x-x1)(x-x2)
y = 1 (x-1)(x-3)
y = x²-x-3x + 3
y = x² - 4x + 3
Jadi Jadi persamaan kuadrat yang sesuai denagn grafik diatas yaitu
y = x² - 4x + 3
maaf gak pake rumus panjang.