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(4p - 5)²
400
1 x 400
2 x 200
4 x 100
5 x 80
8 x 50
10 x 40
20 x 20
16p² - 40p + 25
16p² - 20p - 20p + 25
4p(4p - 5) - 5(4p - 5)
(4p - 5)(4p - 5)
4p - 5 = 0 atau
4p = - 5
p = - 5/4