bonjour
N (t) = - 5 t² + 130 t + 600
T (0) = 600
T (13) = - 5 *13² + 130 *13 + 600 = - 845 + 1 690 + 600 = 1 445
- 5 t² + 130 t + 600 = 0
Δ = 130 ² - 4 ( - 5 * 600 ) = 16 900 + 12 000 = 28 900
x 1 = ( - 130 - 170 ) / - 10 = - 300 /-10 = 30
x 2 = ( - 130 + 170 ) / - 10 = - 40 /10 = - 4