Répondre :
Le - s'applique à (2y-7)(4y-5)
[tex] B = (y-9)(3y+2)-(2y-7)(4y-5) \\B=(3y^2+2y-27y-18)-(8y^2-10y-28y+35) \\B=3y^2+2y-27y-18-8y^2+10y+28y-35 \\B=-5y^213y-40[/tex]
[tex] B = (y-9)(3y+2)-(2y-7)(4y-5) \\B=(3y^2+2y-27y-18)-(8y^2-10y-28y+35) \\B=3y^2+2y-27y-18-8y^2+10y+28y-35 \\B=-5y^213y-40[/tex]