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
