Applications: Exercice 3. Ex:3 Factoriser chaque expression. C = (4x - 21)(9x - 7) + (9x-7)(- 6x-9) D=(-7x + 1)(x + 2)-(-9_5.x)- 7x + 1) vite svp
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Question
Applications: Exercice 3. Ex:3 Factoriser chaque expression. C = (4x - 21)(9x - 7) + (9x-7)(- 6x-9) D=(-7x + 1)(x + 2)-(-9_5.x)- 7x + 1) vite svp
1 Réponse
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1. Réponse hirondelle52
Bonsoir,
C = (4x - 21)(9x - 7) + (9x-7)(- 6x-9)
= (9x-7) ( 4x-21 -6x -9)
= (9x-7) ( -2x -30)
D=(-7x + 1)(x + 2)-(-9-5.x)+(-7x + 1)
= (-7x+1) ( x+2+9 +5x +1)
= (-7x+1) (6x+12)