Factor Completely $$x ^ { 2 } - 2 x + 1$$

Multiple Choice

Factor completely. If the polynomial cannot be factored, write ʺprime.ʺ
- $$x ^ { 2 } - 2 x + 1$$

A) $( x + 1 ) ( x - 1 )$
B) $( x + 1 ) ^ { 2 }$
C) $( x + 2 ) ( x - 2 )$
D) $( x - 1 ) ^ { 2 }$