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- 8 = a (0 - 2) (0 - 4)
- 8 = a (- 2) (- 4)
- 8 = 8a
a = - 8/8
a = - 1
pers fungsi :
y = a (x - x1) (x - x2)
y = - 1 (x - 2) (x - 4)
y = - 1 (x² - 6x + 8)
y = - x² + 6x - 8