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Lololol55
@Lololol55
April 2019
1
15
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URGENT SVP
on considére l'expression suivante:
A=9x²-25+(3x-5)(2x+15).
1) Developper et reduire l'espression A
2)Calculer A pour x=1
3) a) factoriser 9x²-25
b) En deduire la fraction de l'expression A
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winner123
Verified answer
Bonsoir
A = 9 x² - 25 + 6 x² + 45 x - 10 x - 75
a = 15 x² + 35 x - 100
pour x = 1
a = 15 +35 +100 = 150
9 x² - 25 = ( 3 x +5) ( 3 x -5)
a = ( 3x -5) ( 3 x +5 + 2 x +15)
a = ( 3 x- 5) ( 5 x + 20)
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Verified answer
BonsoirA = 9 x² - 25 + 6 x² + 45 x - 10 x - 75
a = 15 x² + 35 x - 100
pour x = 1
a = 15 +35 +100 = 150
9 x² - 25 = ( 3 x +5) ( 3 x -5)
a = ( 3x -5) ( 3 x +5 + 2 x +15)
a = ( 3 x- 5) ( 5 x + 20)