☺ Salut ☻
[tex]\rule{0.5cm}{1mm}DEVELOPPER\: ET\: REDUIRE\rule{0.5cm}{1mm}[/tex]
[tex]\boxed{B=-2x(x+3)}[/tex]
[tex]\boxed{B=-2x\times x -2x\times 3}[/tex]
[tex]\boxed{\boxed{\green{B=-2x^{2}-6x}}}[/tex]
[tex]\rule{6cm}{1mm}[/tex]
[tex]\boxed{D=-3x(1-x)}[/tex]
[tex]\boxed{D=-3x\times 1 -3x\times (-x)}[/tex]
[tex]\boxed{\boxed{\green{D=-3x+3x^{2}}}}[/tex]
[tex]\rule{6cm}{1mm}[/tex]
[tex]\boxed{F=-4x^{2}+B}[/tex]
[tex]\boxed{F=-4x^{2}-2x^{2}-6x}[/tex]
[tex]\boxed{\boxed{\green{F=-6x^{2}-6x}}}[/tex]
[tex]\rule{6cm}{1mm}[/tex]
