A = x² + 3x - 2
donc, si x = racine carrée de 2,
A = (racinede2)² + 3*(racinede2) - 2
A = 2 + 3*racinede2 - 2
A = 3*racinede2
si x = 2*(racinede3)
A = (2*(racinede3))² + 3*(2*(racinede3)) - 2
A = 4*3 + 3*2*(racinede3) - 2
A = 12 + 6*(racinede3) - 2
A = 10 + 6*(racinede3)
Voilà Bon Week End! :)