bonjour
1 ) A (x) = x²
B ( x) = ( x + 1) ²
2 ) x² = ( x + 1 )²
x² = x² + 2 x + 1
x² - x² - 2 x = 1
- 2 x = 1
x = - 1/2
3 ) f ( √2 + 1) = ( √2 + 1 )² = 2 + 2 √2 + 1 = 3 + 2 √2
g ( √2 + 1 ) = ( √2 + 2 )² = 2 + 4 √2 + 4 = 6 + 4 √2
4 ) fait en 2
