Respuesta :

Solutions:

  1. [tex] {x}^{2} - 7x + 12 \\ = {x}^{2} - 3x - 4x + 12 \\ = x(x - 3) - 4(x - 3) \\ = (x - 3)(x - 4)[/tex]
  2. [tex] {4a}^{2} + 24a + 9 \\ = 4a(a + 6) + 9[/tex]
  3. [tex] {49x}^{2} - {16y}^{2} \\ = {(7x)}^{2} - {(4y)}^{2} \\ = (7x - 4y)(7x + 4y)[/tex]

Hope it helps.

Do comment if you have any query.