January 2019 2 18 Report
Titik puncak grafik fungsi kuadrat f(x) = ax^2 + bx + c terletak di sumbu Y. Jika a < 0, persamaan fungsi yang mungkin adalah ...

a. f(x) = -x^2 + 4
b. f(x) = -x^2 + 2x
c. f(x) = -x^2 + 8x
d. f(x) = -x^2 - 2x + 8
e. f(x) = -x^2 + 2x + 8
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