résolu

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)

Répondre :

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)

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