What value, in place of the question mark, makes the polynomial below a perfect square trinomial? x2 + 14x + ?

49. To determine a perfect square tribunal, divide the middle term by two, the square it. (In a case where the squared term has a coefficient, make sure to divide the entire trinomial by it to get rid of it, otherwise this rule won’t work)

14/2 = 7
7^2 = 49