No.
The given quadratic expression can not be factored as a perfect square.
121
x2 - 14x + 49 = (x - 7)2
168
(x + 3)(x + 3)
49
49
26
38
144
(b/2)^2= 64
A perfect square is any bionomial that can be written as (x+y)2. X2 can be written as (x+0)2 so it is a perfect square