Réponse :
Explications étape par étape :
a) (2x + 3)(6x + 7) + (2 - 4x)(3x + 1) = 3x - 7
→ 12x² + 14x + 18x + 21 + 6x + 2 - 12x² - 4x = 3x - 7
→ 34x + 23 = 3x - 7
→ 34x - 3x = -7 - 23
→ 31x = -30
→ x = -30/31
b) (2x + 1)(x - 2) + (3x - 5)(2x + 1) = 0
(2x + 1)((x - 2) + (3x - 5) = 0
(2x + 1)(x - 2 + 3x - 5) = 0
(2x + 1)(4x - 7) =0
→ 2x + 1 = 0 → 2x = -1 → x = -1/2
→ 4x - 7 = 0 → 4x = 7 → x =7/4
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Réponse :
Explications étape par étape :
a) (2x + 3)(6x + 7) + (2 - 4x)(3x + 1) = 3x - 7
→ 12x² + 14x + 18x + 21 + 6x + 2 - 12x² - 4x = 3x - 7
→ 34x + 23 = 3x - 7
→ 34x - 3x = -7 - 23
→ 31x = -30
→ x = -30/31
b) (2x + 1)(x - 2) + (3x - 5)(2x + 1) = 0
(2x + 1)((x - 2) + (3x - 5) = 0
(2x + 1)(x - 2 + 3x - 5) = 0
(2x + 1)(4x - 7) =0
→ 2x + 1 = 0 → 2x = -1 → x = -1/2
→ 4x - 7 = 0 → 4x = 7 → x =7/4