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l = x
maka
2(3x - 2 + x) ≤ 52
2(4x - 2) ≤ 52
8x - 4 ≤ 52
8x - 4 + 4 = ≤ 52 + 4
8x ≤ 56
x ≤ 7
sehingga x maximal adalah 7
p = 3x - 2 = 3(7) - 2 = 21-2 = 19 cm
l = x = 7 cm
luas = p x l = 19 cm x 17 cm = 323 cm²