Sagot :
Réponse:
• Exercice 1 :
1) A=5-6x²-2x
2) a. x=7/2
b. x=26/9
• Exercise 2 :
1) 1297
2) 289
3) (4x)²+1 = 16x²+1
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bonjour
A = 5 x - ( 3 x + 5 ) ( 2 x - 1 )
A = 5 x - ( 6 x² - 3 x + 10 x - 5 )
A = 5 x - 6 x² + 3 x - 10 x + 5
A = - 6 x² - 2 x + 5
2 ) 8 x + 5 = 12 x - 9
8 x - 12 x = - 9 - 5
- 4 x = - 14
x = 14/4 = 7/2
5 ( - 2 x + 9) = 8 x - 7
- 10 x + 45 = 8 x - 7
- 10 x - 8 x = - 7 - 45
- 18 x = - 52
x = 52/18 = 26/9
x
4 x
( 4 x)² = 16 x²
16 x² + 1
9
4 *9 = 36
36 ² + 1 = 1 297
√ 18
4 √18
( 4 √18)² + 1 = 289