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Verified answer
Jawabpersamaan kuadrat
x1= 2 , x2 = 6 --> y = a (x - x1)(x - x2)
y = a(x - 2)(x - 6)
melalui (4,2) --> 2= a(4-2)(4-6)
2 = a(2)(-2)
2= -4a
a= - 2
persamaan
y = -2(x - 2)(x - 6)
y = -2 (x² - 8x + 12)
y = - 2x²+ 16x - 24