Factoriser j'y arrive pas svp : a) 2x²-5x = (2x-5)(2x+4) b) 4(x-1)²-(x+1)² c) (2x+1)²-4x-2+(4x²-1)
Mathématiques
Lucas93160
Question
Factoriser j'y arrive pas svp : a) 2x²-5x = (2x-5)(2x+4) b) 4(x-1)²-(x+1)² c) (2x+1)²-4x-2+(4x²-1)
1 Réponse
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1. Réponse Eileen
a) 2x²-5x = (2x-5)(2x+4)
=2x(-5+4)
b) 4(x-1)²-(x+1)²
=(2(x-1)-(x+1))²
=(2(x-1)-x-1)²
c) (2x+1)²-4x-2+(4x²-1)
(2x+1)²-(2)²x-2