Bonjour, voila ma question: Développer A= (-3x +1) (x-5) B= (x-9) (-4+x) C= (2x-8)(-2x +1) Factoriser: A=7a-7 B=4 (x-1) - 5x (x-1)
Mathématiques
rayanemesdaou
Question
Bonjour, voila ma question:
Développer
A= (-3x +1) (x-5)
B= (x-9) (-4+x)
C= (2x-8)(-2x +1)
Factoriser:
A=7a-7
B=4 (x-1) - 5x (x-1)
Développer
A= (-3x +1) (x-5)
B= (x-9) (-4+x)
C= (2x-8)(-2x +1)
Factoriser:
A=7a-7
B=4 (x-1) - 5x (x-1)
1 Réponse
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1. Réponse Anonyme
Bonjour,
(-3x+1)(x-5) = -3x²+15x+x-5 = -3x²+16x-5
(x-9)(-4+x) = -4x+x²+36-9x = x²-13x+36
(2x-8)(-2x+1) = -4x²+2x+16x-8 = -4x²+18x-8
7a-7 = 7(a-1)
4(x-1)-5x(x-1) = (x-1)(4-5x)