Explications étape par étape:

A = 50x + 50

B = 54x ( 1 - x ) = 54x - 54x carré

C = 20x - 15

D = 50x - 8

E = 12x carré - 30x. = 6x ( 2x - 5 )

exo 2

A = 6x carré + 29x + 35. = ( 2x + 5 ) ( 3x + 7 )

B = 10x carré - 19x - 56 = ( 2x - 7 ) ( 5x + 8 )

C = 6x carré + 16x - 6. = 2 ( 3x - 1 ) ( x + 3 )

D = 18x carré - 14x + 19

E = 28x carré +- 34x - 19

F = 19x - 31