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p = 2
q = 8
y = a(x - p)² + q
y = a(x - 2)² + 8
melalui titik (4, 0)
x = 4
y = 0
y = a(x - 2)² + 8
0 = a(4 - 2)² + 8
0 = a(2)² + 8
0 = 4a + 8
4a = -8
a = -2
persamaan fungsi kuadrat
y = a(x - 2)² + 8
y = -2(x² - 4x + 4) + 8
y = -2x² + 8x - 8 + 8
y = -2x² + 8x
Jawabannya E