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Persamaan garis AB:
Luas persegi panjang:
L = y.x
= y (8 - 2y)
= 8y - 2y²
Agar luas maksimum:
L' = 0
8 - 4y = 0
y = 2
L maksimum = 8.2 - 2.2² = 16 - 8 = 8 satuan luas