Answered

Qui peux m'aider ?:3

Développer:
A=(x^2+x+3)(x-2)
B=(x-2)^2-(x+2)2

Factoriser:
C=(2x+1)^2-(5x-3)^2
D=9x^2-1+(6x-2)(x-4)

Sagot :

DROOPETTE
A=(x²+x+3)(x-2)
=x³-2x²+x²-2x+3x-6
=x³-x²+x-6

B=(x-2)²-(x+2)2
=x²-4x+2-2x-4
=x²-6x-2

Factoriser:
C=(2x+1)²-(5x-3)²
=(2x+1-5x+3)(2x+1+5x-3)
=(-3x+4)(7x-2)

D=9x²-1+(6x-2)(x-4)
=(3x+1)(3x-1)+2(3x-1)(x-4)
=(3x-1)(3x+1+2x-8)
=(3x-1)(5x-7)
Salut :) 

B=(x-2)²-(x+2)² 
 
 Voila bisous :)