Répondre :
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
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)
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