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x = -b/2a
x = - (-2)/2×1
x = 2/2
x = 1
f (x) = x^2 - 2x - 3
f (x) = 1^2 - (2×1) - 3
= 1 - 2 - 3
f (x) = -4
maka nilai minimum fungsi kuadrat diatas adalah -4