Divisez par 2 : x³ + 4x² = 192

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• Soit largeur = x → longueur = 2x, hauteur = x + 4
• Volume = l × w × h = 2x × x × (x + 4) = 2x²(x + 4) = 2x³ + 8x²
• Posons équation : 2x³ + 8x² = 384
• x³ + 4x² - 192 = 0
• Test x = 6 : 216 + 144 - 192 = 168 → trop haut
• x = 5 : 125 + 100 = 225 - 192 = 33 → trop haut

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