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(-1,0) : x₂ = -1
y = a (x-3) (x+1)
mell (4,10) --> x = 4, y = 10
10 = a (4-3)(4+1)
10 = 5 a ----> a = 2
y = 2 (x-3) (x+1)
= 2 (x²-2x-3)
= 2x² - 4x - 6