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x² - 4x = 16y - 56
(x² - 4x + 4) - 4 = 16y - 56
(x - 2)² = 16y -56 + 4
(x - 2)² = 16 y - 52
(x - 2)² = 16 (y - 52/16)
(x - 2)² = 4 (4) (y - 13/4)
jadi nilai p =4
lactus rektum = 4p = 4 x 4 = 16