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pers umum : y = a (x - xs)² + yp
= a (x-3)² + 5 --> melalui (1,9)--> x=1, y=9
9 = a (1-3)² + 5
4 = a (-2)²
a = 1
y = 1 (x-3)² + 5
= x²-6x+9 + 5
= x² - 6x + 14