The given expression is
x^2 + 16x = 14x + 191
The first step is to subtract 14x from both sides of the expression. Thus, we have
x^2 + 16x - 14x = 14x - 14x + 191
x^2 + 2x = 191
To complete the square, we would add the square of half the coefficient of x to both sides of the equation. The coefficient off x is 2. Half of 2 is 1. Thus, we have
x^2 + 2x + 1^2 = 191 + 1^2
(x + 1)^2 = 191 + 1
(x + 1)^2 = 192
Thus, the intermediate step is (x + 1)^2 = 192