Bonjour,
1) A = L × l = (3x - 1)(2x - 3)
= 6x²-9x-2x+3
= 6x²-11x+3
2) P = 2 × (L + l) = 2[(3x-1)+(2x-3)]
= 2(5x-4)
= 10x-8
3) 10x - 8 = 74 ⇒ 10x = 74 + 8 = 82
⇒ x = 82/10 = 8,2 (cm)
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Bonjour,
1) A = L × l = (3x - 1)(2x - 3)
= 6x²-9x-2x+3
= 6x²-11x+3
2) P = 2 × (L + l) = 2[(3x-1)+(2x-3)]
= 2(5x-4)
= 10x-8
3) 10x - 8 = 74 ⇒ 10x = 74 + 8 = 82
⇒ x = 82/10 = 8,2 (cm)