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P = 5 + ℓ
L = P x ℓ
750 = (5 + ℓ) x ℓ
750 = 5ℓ + ℓ²
ℓ² + 5ℓ - 750 = 0
(ℓ + 30) (ℓ - 25) = 0
ℓ = -30 cm
ℓ = 25 cm
Karena lebar tidak mungkin negatif, maka lebarnya adalah 25 cm
semntara, panjang = ℓ + 5
panjang = 25 + 5
panjang = 30 cm
Ok?