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jawab

fungsi kuadrat

titk balik ( -2, 9) --> y = a(x + 2)² + 9
(0,5)--> 5 =a(2)² +9
4a= -4
a= - 1
y =- (x +2)² + 9
y = -(x² + 4x + 4) +9
y=  - x²- 4x + 5