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Fc28
@Fc28
January 2021
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Merci de m'aider svp
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winner123
Verified answer
Bonsoir
A = 10 x² - ( 2 x + 3)²
1. pour x = 2
A = 10(2²) - ( 4 + 3)²
A = 40 - 49 =
- 9
2. A = 10 x² - ( 4 x² + 12 x + 9)
A = 10 x² - 4 x² - 12 x - 9
A = 6 x² - 12 x - 9
pour x = 2
A = 24 - 24 - 9 =
9
B = 7 x² - ( 2 x + 4)²
B = 7 x² - ( 4 x² + 16 x + 16)
B = 7 x² - 4 x² - 16 x - 16
B = 3 x² - 16 x - 16
C = 8 x - ( 6 x² + 8 x - 9 x - 12)
C = 8 x - 6 x² - 8 x + 9 x + 12
C = - 6 x² + 9 x + 12
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Verified answer
BonsoirA = 10 x² - ( 2 x + 3)²
1. pour x = 2
A = 10(2²) - ( 4 + 3)²
A = 40 - 49 = - 9
2. A = 10 x² - ( 4 x² + 12 x + 9)
A = 10 x² - 4 x² - 12 x - 9
A = 6 x² - 12 x - 9
pour x = 2
A = 24 - 24 - 9 = 9
B = 7 x² - ( 2 x + 4)²
B = 7 x² - ( 4 x² + 16 x + 16)
B = 7 x² - 4 x² - 16 x - 16
B = 3 x² - 16 x - 16
C = 8 x - ( 6 x² + 8 x - 9 x - 12)
C = 8 x - 6 x² - 8 x + 9 x + 12
C = - 6 x² + 9 x + 12