Answered

Je n'arrive pas a factoriser l'expression (x-1)(4x+5)-(x-1) au carrer

Sagot :

DROOPETTE
(x-1)(4x+5)-(x-1)²
=(x-1)(4x+5)-(x-1)(x-1)
=(x-1)(4x+5-x+1)
=(x-1)(3x+6)
=3(x-1)(x+2)