bonjour
A = 3 x² + 4 x +6 x + 8 - ( 5 x² - 3 x + 10 x - 6 )
= 3 x² + 10 x + 8 - 5 x² + 3 x - 10 x + 6
= - 2 x² + 3 x + 14
A = ( x + 2 ) ( 3 x + 4 - 5 x + 3 )
= ( x + 2 ) ( - 2 x + 7 )
B = ( 3 x + 6 ) ( x + 8) + ( x + 2 )
= 3 x² + 24 x + 6 x + 48 + x + 2
= 3 x² + 31 x + 2
B = ( x + 2 ) ( 3 x + 24 + 1 )
= ( x + 2 ) ( 3 x + 25 )
C = x² + 4 x + 4 + 4 x + 8
= x² + 8 x + 12
C = ( x + 2 ) ( x + 2 + 4 x + 8 )
= ( x + 2 ) ( 5 x + 10 )
D = 5 x + 10 - x² - 2 x + x² - 4
= 3 x + 6
D = ( 5 - x ) ( x + 2 ) + ( x - 2 ) ( x + 2)
= ( x + 2 ) ( 5 - x + x - 2 )
= ( x+ 2 ) ( 3)
