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(-3,0), (1,0) ---> y = a(x+3)(x-1)
melalui (x,y)= 2,10 --> 10 = a(2+3)(2-1)
10 = a(5)(1)
a = 2
pers fungsi y = 2(x+3)(x-1)
y = 2(x² + 2x - 3)
y = 2x² + 4x - 6
...