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Baltos
@Baltos
April 2019
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Bonjour j'ai un DM pour lundi 27.
Sois deux expressions A et B.
A=9-(2x-3)²
B=(3x-7)²-49
Factoriser A+B.
J'ai déjà factoriser A et B avant A+B (autre question).
Ma réponse :
A+B=[9-(2x-3)²]+[(3x-7)-49]
A+B=2x(6-2x)+3x(3x-14)
A+B=je n'arrive plus.
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ryanmanalo53
(3-2x-3)(3+2x-3)+(3x-7+7)(3x-7-7)
(-2x)(2x)+(3x)(-3x)
-4x-9x
-13x
Je l'ai fait cette methode car c'est factoricer non pas Développer...
0 votes
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lucielefevre56
Je pense que tu devrais d'abord factoriser a et ensuite b pour ensuite les additionné.
a= 9-(2x-3)
²
= 9-(-6)
²
=9-36
=-27
b=
(3x-7)²-49
=(-21)
²-49
=441-49
=392
a+b= -27+392= 365
je pense que c'est ça
0 votes
Thanks 0
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Lista de comentários
(-2x)(2x)+(3x)(-3x)
-4x-9x
-13x
Je l'ai fait cette methode car c'est factoricer non pas Développer...
a= 9-(2x-3)²
= 9-(-6)²
=9-36
=-27
b=(3x-7)²-49
=(-21)²-49
=441-49
=392
a+b= -27+392= 365
je pense que c'est ça