bonjour
F (x) = 2 x² - 12 x + x - 6 = 2 x² - 11 x - 6
G (x) = - 4 x² + 12 x - 5 x + 15 - 8 x² - 4 x
= - 12 x² + 3 x + 15
H (x ) = 2 x - 6 + 4 x² + x - 4 x - 1
= 4 x² - x - 7
I (x) = 7 x² + 14 x - 2 x - 4 - ( 9 x - 3 x² + 3 - x )
= 7 x² + 12 x - 4 - 9 x + 3 x² - x + x
= 10 x² + 3 x - 4
J (x ) = ( x² + 2 x + x + 2 ) ( x + 3 )
= ( x² + 3 x + 2 ) ( x + 3 )
= x ³ + 3 x² + 3 x² + 9 x + 2 x + 6
= x ³ + 6 x² + 11 x + 6
