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a = -1
b = 5
c = c
puncak absis = -b/2a
= -5/2(-1)
= 5/2
f (5/2) = -(5/2)² + 5(5/2) + c
-(5/2)² + 5(5/2) + c = 6
-25/4 + 25/2 + c = 6
-25/4 + 50/4 + c = 24/4
25/4 + c = 24/4
c = 24/4 - 25/4
c = -1/4