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= a(x + b/2a)² - D/4a
f(x) = a(x -1)² - 4 melalui titik (3,0)
0 = a(3 - 1)² -4
4 = 4a
a = 1
Jadi, fungsi kuadrat tersebut adalah f(x) = 1(x - 1)² - 4
f(x) = x² - 2x - 3