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Luffyforce
@Luffyforce
April 2019
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Exercice n°2 : On considère l'expression :
E = (3x + 7)² – (3x + 7)(5x – 2 )
1)Développer et réduire E.
2)Factoriser E.
3)Prouver que pour x = 92
, E = 0.
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Rachidael251
Verified answer
1) 9 (x au carré)+49+42x-15 (x au carré)+6x-35x+14
= - 6 (x au carré)+13x+48
= -( 6 xau carré -13x-48)
2) (3x+7)[(3x+7)-(5x-2)]
= (3x+7)(3x+7-5x+2)
= (3x+7)(9-2x)
3) (3*92+7)^2 - (3*92+7)(5*92-2)
=(283)^2-(283)(458)
= (80 089)-(129 614)
= -49525 bizarrement j'ai pas trouvé 0
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Trasformer ce passage au discours direct: Il disait qu'il voulait absolument que je lui raconte ce que tu avais fait depuis la veille;
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Lista de comentários
Verified answer
1) 9 (x au carré)+49+42x-15 (x au carré)+6x-35x+14= - 6 (x au carré)+13x+48
= -( 6 xau carré -13x-48)
2) (3x+7)[(3x+7)-(5x-2)]
= (3x+7)(3x+7-5x+2)
= (3x+7)(9-2x)
3) (3*92+7)^2 - (3*92+7)(5*92-2)
=(283)^2-(283)(458)
= (80 089)-(129 614)
= -49525 bizarrement j'ai pas trouvé 0