Bonjour pouvez-vous m'aider svp ??​

bonjour

A =  2 x ( x + 3 ) - 4 ( x + 3 )

A = ( x + 3) ( 2 x - 4 )

A =  2 ( x + 3 ) ( x - 2 )

B = ( 3 x - 2 )²

D =  ( 5 x + 10 ) ( x - 6 ) + ( 3 x + 4 ) ( x + 2 )

D =  5 ( x + 2 ) ( x - 6 ) + ( 3 x + 4 ) ( x + 2 )

D = ( x + 2)  ( 5 x - 30 + 3 x + 4 )

D = ( x + 2 ) ( 8 x - 26 )

C = 5 x ⁴ - 3 x² = x² ( 5 x² - 3 )

5 x² - 4 x = 0

x ( 5 x - 4 ) = 0

x = 0 ou 4 /5

9 x² - 16 = 0

( 3 x - 4 ) ( 3 x + 4 ) = 0

x = 4/3 ou - 4/3