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dengan 4p = panjang latus rectum
..
y = 1/2 x² -2x+ 7
1/2 x² -2x = y -7 ... kalikan 2
x² - 4x = 2y - 14
(x²-4x) = 2y - 14
(x-2)² = 2y - 14 + 4
(x-2)² = 2y - 10
(x-2)² = 2(y-5)
..
panjang latus rectum = 4p = 2