bonjour
- x² + 2 x + 1
α = - 2 / - 2 = 1
β = - ( 1)² + 2 + 1 = - 1 + 2 + 1 = 2
x ( x - 1 )² + 2
2 x² - 6 x + 10
α = - ( - 6 )/ 4 = 6 /4 = 3 /2
β = 2 ( 3/2)² - 6 ( 3/2 ) + 10
β = 2 * 9/4 - 18/2 + 10
β = 18/4 - 9 + 10 = 9/2 + 1 = 9/2 + 2/2 = 11 /2
2 ( x - 3 /2 )²+ 11 /2