Simplifiez : \( 4x^2 + 50x - 114 = 0 \).
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- Les nouvelles dimensions sont \( (15 + 2x) \) par \( (10 + 2x) \).
- L'équation est \( (15 + 2x)(10 + 2x) = 264 \).
- Développez : \( 150 + 30x + 20x + 4x^2 = 264 \).
- Résolvez en utilisant la formule quadratique : \( x = \frac{-50 \pm \sqrt{50^2 - 4 \times 4 \times (-114)}}{2 \times 4} \).
- Calculez : \( x = \frac{-50 \pm \sqrt{2500 + 1824}}{8} = \frac{-50 \pm \sqrt{4324}}{8} \).
- Approximativement : \( x = \frac{-50 \pm 65,74}{8} \).
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