- Factoriser l'expression: (2a - 1) (a + 3) + (4a - 5) (a + 3)

(2a - 1) (a + 3) + (4a - 5) (a + 3) = (a+3)(2a-1+4a-5) = (a+3)(6a-6)

Réponse:

(a+3)(6a-6)

Explications étape par étape:

(2a - 1) (a + 3) + (4a - 5) (a + 3)

(a + 3) (2a - 1 + 4a - 5)

(a + 3) (6a - 6)