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julieleagym
@julieleagym
January 2021
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bonjour pouvez-vous m'aider pour cet exercice Le 1 je l'ai fait mais le 2 et 3 je n'y arrive pas à merci de votre aide
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rosiemuller2000
Verified answer
Coucou
je t ai fait les calculs c est en photo
voila j espere t avoir aider
1 votes
Thanks 1
julieleagym
merci énormément !
rosiemuller2000
de rien ;)
Christine17
EX105
D=(12x+3)(2x-7)-(2x-7)²
1)
24x²-84x+6x-21-(4x²+49-28x)=
24x²-84x+6x-21-4x²-49+28x=
20x²-50x-70=10(2x²-5x-7)
2)
D=(12x+3)(2x-7)-(2x-7)²
D=(2x-7)(12x+3)-(2x-7)
D=(2x-7)(10x+10)
D=10(2x-7)(x+1)
3)
pour x=2
D=10x-3x3=-90
pour x=-1
D=0 car x+1=0
0 votes
Thanks 1
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Verified answer
Coucouje t ai fait les calculs c est en photo
voila j espere t avoir aider
D=(12x+3)(2x-7)-(2x-7)²
1)
24x²-84x+6x-21-(4x²+49-28x)=
24x²-84x+6x-21-4x²-49+28x=
20x²-50x-70=10(2x²-5x-7)
2)
D=(12x+3)(2x-7)-(2x-7)²
D=(2x-7)(12x+3)-(2x-7)
D=(2x-7)(10x+10)
D=10(2x-7)(x+1)
3)
pour x=2
D=10x-3x3=-90
pour x=-1
D=0 car x+1=0