Exercice 4: Résoudre les équations suivantes : (4x - 3) (3x - 3) = 0 7x (3x - 5) (5x - 3) = 0 (2x + 1)(2x - 3) + 4x² - 9=0 27x² + 9x +3=0 9x² - 4 = (3x + 2)(2x - 1) (2x+3)(x-1)-(2x + 3) (2x - 4) = 0
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Réponse:
4x-3=0 ou. 3x-3=0
4x=3. 3x=3
x=3/4. x=3/3=1
(2x+1)(2x-3)+(2x+3)(2x-3)=0
(2x-3)(2x+1+2x+3)=0
(2x-3)(4x+4)=0
2x=3. 4x=-4
x=3/2. x=-4/4=-1