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y = ax² - 6x + 24
-------------------------- -
0 = - ax² + 12x - 36
syarat bersinggungan D = 0
b² - 4.a.c = 0
(12)² - 4 .- a. (-36) = 0
144 - 144.a = 0
-144.a = - 144
a = 1
persamaan parabola : y = x² - 6x + 24
absis puncak = persamaan sumbu simetri
=
=
= 3