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(1/2p - 5)(2p - 8)
p² - 4p - 10p + 40
p² - 14p + 40
NOMOR 2
(30 - 5)(3p - 5)
90p - 150 - 15p + 25
75p - 125
NOMOR 3
(x + 2)(x - 20)
x² - 20x + 2x - 40
x² - 18x - 40
NOMOR 4
(3y - 1)(3y + 1)
9y² + 3y - 3y - 1
9y² - 1