factorise 2x²-18+(5x-7)(3-x)-(4x-12)(x+2) aidez moi svp pour factorise
BREVET
aboubacrina
Question
factorise
2x²-18+(5x-7)(3-x)-(4x-12)(x+2)
aidez moi svp pour factorise
2x²-18+(5x-7)(3-x)-(4x-12)(x+2)
aidez moi svp pour factorise
1 Réponse
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1. Réponse loulakar
Bonjour
Factorise 2x²-18+(5x-7)(3-x)-(4x-12)(x+2)
= 2(x^2 - 9) + (5x - 7)(3 - x) - 4(x - 3)(x + 2)= 2(x - 3)(x + 3) - (x - 3)(5x - 7) - 4(x - 3)(x + 2)
= (x - 3)[2(x + 3) - (5x - 7) - 4(x + 2)]
= (x - 3)(2x + 6 - 5x + 7 - 4x - 8)= (x - 3)(-7x + 5)