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(y - yp) = a (x - xp)²
(y - 2) = a (x - 1)²
(3 - 2) = a (2 - 1)²
1 = 1 a
a = 1
(y - 2) = 1 (x - 1)²
y - 2 = x² - 2x + 1
y = x² - 2x + 1 + 2
y = x² - 2x + 3 (B)
5) grafik tsb melalui titik (3,0), (-1,0) dan (1,4)
dgn substitusi ke opsi jawaban, yg benar hanya opsi A. y = -x² + 2x + 3
11) y = (x - 6) (x + 2)
y = x² - 4x - 12
x = -b/2a
x = -(-4)/2.1
x = 2
y = 2² - 4 (2) - 12
y = 4 - 8 - 12
y = -16
titik balik --> (2,-16) (D)
semoga membantu :)