bonjour,
F= (3x + 5)(2x - 3)
3x*2x= 6x²
3x*-3 = -9x
5*2x = 10x
(*-3 = -15
=> 6x² -9x +10x -15 = 6x² +x -15
G= (-3y - 2)(-2y + 3)
-3y*-2y = 6y²
-3y * 3 = -9y
-2*-2y = 4y
-2*3 = -6
=>
6y² -9y +4y -6 = 6y² -5y -6
Bonjour,
développer les expressions:
F= (3x + 5)(2x - 3)
F= 3x*2x+5*2x-3*3x-3*5
F= 6x²+10x-9x-15
F= 6x²+x-15
G= (-3y - 2)(-2y + 3)
G= 6y²+4y-9y-6
G= 6y²-5y-6