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fungsi kuadrat itu f(x) = ax² + bx + c
-b/2a = 1
b = -2a
melalui (0,3) ⇒ 3 = c
grafik terbuka kebawah maka a < 0
a = -1
b = 2
maka f(x) = -x² + 2x + 3 (B)