The answer to your question is letter D.
Step-by-step explanation:
Polynomial        u² + 22u + c = 0
Process
1.- Equal to zero
                 u² + 22u    = 0
2.- Divide 22 by 2
 22/2 = 1
3.- Place 11² as a third term
                 u² + 22u + (11)²
4.- Simplify
                 u² + 22u + 121
                                              Â