Factor the trinomial by grouping.
40x + 25x^2 + 16

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!