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Hafsouna2
@Hafsouna2
May 2019
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Bonjours j'ai besoin d'aide pour développer et réduire ces équation merci!
Développer et réduire A= (2x - 5)(x + 7)
Et
B=(x + 9)(7x - 2)
En déduire les formes réduites de C= A + B et D= A - B
Merci!
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wiwi06
A) (2x*x+2x*7)+(-5*x+-5*7)
B) (x*7x)+(x*-2)+(9*7x)+(9*-2)
( à toi de terminer )
0 votes
Thanks 0
remilesochalieoz9a2c
Salut ! :)
A = (2x - 5)(x + 7)
= 2x×x + 2x×7 + (-5)×x + (-5)×7
= 2x² + 14x - 5x - 35
= 2x² + 9x - 35
B = (x + 9)(7x - 2)
= x×7x + x×(-2) + 9×7x + 9×(-2)
= 7x² - 2x + 63x - 18
= 7x² + 61x - 18
C = A + B
= 2x² + 9x - 35 + 7x² + 61x - 18
= 9x² + 70x - 53
D = A - B
= 2x² + 9x - 35 - (7x² + 61x - 18)
= 2x² + 9x - 35 - 7x² - 61x + 18
= -5x² - 52x - 17
Voilà, j'espère t'avoir aidé. :)
2 votes
Thanks 1
Hafsouna2
merciii^^
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B) (x*7x)+(x*-2)+(9*7x)+(9*-2)
( à toi de terminer )
A = (2x - 5)(x + 7)
= 2x×x + 2x×7 + (-5)×x + (-5)×7
= 2x² + 14x - 5x - 35
= 2x² + 9x - 35
B = (x + 9)(7x - 2)
= x×7x + x×(-2) + 9×7x + 9×(-2)
= 7x² - 2x + 63x - 18
= 7x² + 61x - 18
C = A + B
= 2x² + 9x - 35 + 7x² + 61x - 18
= 9x² + 70x - 53
D = A - B
= 2x² + 9x - 35 - (7x² + 61x - 18)
= 2x² + 9x - 35 - 7x² - 61x + 18
= -5x² - 52x - 17
Voilà, j'espère t'avoir aidé. :)