bonjour
A ( t) = - 3 t² + 5 t - 2
A (t) = ( t - 1 ) ( 2 - 3 t )
= 2 t - 3 t² - 2 + 3 t = - 3 t² + 5 t - 2
A ( t )= 0
( t - 1 ) ( 2 - 3 t ) = 0
t = 1 ou 2/3
B (t) = t² - 8 t + 7
( t - 4 )² - 9 = t² - 8 t + 16 - 9 = t² - 8 t + 7
B (t) = ( t - 4 -3 ) ( t - 4 + 3 ) = ( t - 7 ) ( t - 1 )
