Développer a) (x-2)(x+3) b) -3(x+1)(x-2) c) 2(x+1)^2 -5 d) 3[(x-1)^2 +2]
Mathématiques
lila98
Question
Développer
a) (x-2)(x+3)
b) -3(x+1)(x-2)
c) 2(x+1)^2 -5
d) 3[(x-1)^2 +2]
a) (x-2)(x+3)
b) -3(x+1)(x-2)
c) 2(x+1)^2 -5
d) 3[(x-1)^2 +2]
2 Réponse
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1. Réponse louisdepuis
a)x²-3x-2x-6
dejas c 'est pour la A -
2. Réponse youssra95
a) (x-2)(x+3)
=xXx+xX3-2Xx+2X3
=x²+3x-2x+6
=x²+1+6
b) -3(x+1)(x-2)
=-3(x²-2x+x-2)
=3(x²-x-2
c) 2(x+1)^2 -5
=2(x²+2XxX1+1²)-5
=2(x²+2x+1)-5
=2x²+4x+1-5
=2x²+4x-4
d) 3[(x-1)^2 +2]
=3[(x²-2XxX1+1²)+2
=3(x²-2x+1+2)
=3(x²-2x+3)
=3x²-6x+9