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Parfaite
@Parfaite
May 2019
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Bonjour , excusez moi e vous derangez
je ne suis pas sure pour cet exercice
A= 4x2,-9+(2x+3)(x-1)
DEVOLLPER ET REDUIRE
B=(5x-1)-(7x+3)(x+2)
DEVOLPPER ET REDUIRE
merci de votre attention et de votre aide
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PAU64
Verified answer
A = 4x² - 9 + (2x + 3) (x - 1)
A = 4x² - 9 + 2x * x + 2x * (- 1) + 3 * x + 3 * (- 1)
A = 4x² - 9 + 2x² - 2x + 3x - 3
A = 6x² + x - 12
B = (5x - 1) - (7x + 3) (x + 2)
B = (5x - 1) - (7x * x + 7x * 2 + 3 * x + 3 * 2)
B = (5x - 1) - (7x² + 14x + 3x + 6)
B = 5x - 1 - 7x² - 14x - 3x - 6
B = - 7x² - 12x - 7
2 votes
Thanks 0
PAU64
* désigne "fois"
PAU64
de rien ;)
Arafat2514
il n'y pas un changement de signe ? ...
PAU64
- 3x - 14x + 5x = - 12x et - 1 - 6 = - 7
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Verified answer
A = 4x² - 9 + (2x + 3) (x - 1)A = 4x² - 9 + 2x * x + 2x * (- 1) + 3 * x + 3 * (- 1)
A = 4x² - 9 + 2x² - 2x + 3x - 3
A = 6x² + x - 12
B = (5x - 1) - (7x + 3) (x + 2)
B = (5x - 1) - (7x * x + 7x * 2 + 3 * x + 3 * 2)
B = (5x - 1) - (7x² + 14x + 3x + 6)
B = 5x - 1 - 7x² - 14x - 3x - 6
B = - 7x² - 12x - 7