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y = a(x - 2)² + (-3)
y = a(x - 2)² - 3
melalui titik (0, 5)
5 = a(0 - 2)² - 3
5 = 4a - 3
4a = 5 + 3
4a = 8
a = 2
fungsi kuadrat
y = a(x - 2)² - 3
y = 2(x² - 4x + 4) - 3
y = 2x² - 8x + 8 - 3
y = 2x² - 8x + 5
Jawaban B