Respuesta :

Answer:

A = 25x^2 + 40x + 16

   = (25x^2 + 20x) + (20x + 16)

   = 5x(5x + 4) + 4(5x + 4)

   = (5x + 4)(5x + 4)

   = (5x + 4)^2

Hope this helps!