Verified answer

a) xy + 2x - 3y - 6 = (x - 3)(y + 2)

b) 3a - 6y + ab - 2by =

c) ab + 2b - 3a - 6 =(a - 3)(b + 2)

d) x² - 9 = (x + 3)(x - 3)

e) 4x² - 49 = (2x + 7)(2x -7)

f) x² + 6x + 9 = (x + 3)²

QSL?

a) x (y + 2) -3 (y - 2) = (x - 3) ( y + 2)

b) 3 (a - 2b) +b (a - 2b) = (3 + b) (a - 2b)

c) b (a + 2) -3 (a + 2) = (b - 3) (a + 2)

d) (x - 3) (x + 3)

e) (2x - 7) (2x + 7)

f) (x + 3)²

Espero ter ajudado :D