Bonjour,
1) aire de la partie hachurée: (2x+3)*(2x+3)-(x+1)*(x+1)
2) (2x+3)*(2x+3)-(x+1)*(x+1)=(2x)^2+2*2x*3+3^2-x^2+x*1+1^2=4x^2+4x*3+9-x^2+x+1=4x^2-x^2+12x+x+9+1=3x^2+13x+10
3) (2x+3)*(2x+3)-(x+1)*(x+1)=(2x+3)^2-(x+1)^2
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Bonjour,
1) aire de la partie hachurée: (2x+3)*(2x+3)-(x+1)*(x+1)
2) (2x+3)*(2x+3)-(x+1)*(x+1)=(2x)^2+2*2x*3+3^2-x^2+x*1+1^2=4x^2+4x*3+9-x^2+x+1=4x^2-x^2+12x+x+9+1=3x^2+13x+10
3) (2x+3)*(2x+3)-(x+1)*(x+1)=(2x+3)^2-(x+1)^2