coucou
exercice 17
A=(x+1)(x+2)
A=x²+2x+x+2
A=x²+3x+2
B=(y+3)(y+5)
B=y² +5y+3y+15
B=y² +8y +15
C= (2x+1)(x+4)
C= 2x²+8x+x+4
C=2x² +9x +4
D= (y+2)(3y+11)
D= 3y²+11y+6y+22
D= 3y² + 17y +22
exercice 19
a) (x-1)(x+6)
= x² + 6x -x -6
b) (x+4)(2-3x)
= 2x -3x² +8 -12x
c) (2x-5)(x+7)
=2x²+14x-5x-35
d)(2-3x)(2x+1)
=4x+2-6x²-3
exercice 20
A= (x-3)(x+2)
A= x²+2x-3x-6
A=x²-x-6
B= (y+2)(y-3)
B= y²-3y+2y-6
B= y²-y -6
C= (4x+1)(x-5)
C= 4x²-20x+x-5
C= 4x² -19x -5
D= (5y-2)(y+3)
D= 5y² + 15y -2y -6
D= 5y² + 13y -6
voila j espere t avoir aider
