Sagot :

Réponse :Bonjour,

On factorise par (x-1):

A = (x-1)[(x-1+ 2x+3] = (x-1)(3x+2)

On factorise par (x-5):

B = (x-5)[2x+3-(x-5)] = (x-5)(2x+3-x+5) = (x-5)(x+8)

Bon courage!