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K = 2x + 2y
K = 2(x + y)
K = 2 (12)
K = 24 (keliling maksimal)
x + y = 12
y = 12 - x
L = x.y
L = x(12 - x)
L = 12x - x^2 (gunakan turunan fungsi)
L' = 12 - 2x (luas maximal di dapat jika L' = 0)
0 = 12 - 2x
2x = 12
x = 6
x + y = 12
6 + y = 12
y = 12 - 6
y = 6
L = (6)(6)
L = 36 (Luas maksimal yang didapat)
jangan lupa terima kasih...!!!