Complete the Square to Make the Binomial a Perfect Square $$x ^ { 2 } - 20 x$$

Multiple Choice

Complete the square to make the binomial a perfect square trinomial. $$x ^ { 2 } - 20 x$$

A) $\quad x ^ { 2 } - 10 x + 100$
B) $\quad x ^ { 2 } - 20 x + 100$
C) $\quad x ^ { 2 } - 20 x + 400$
D) $\quad x ^ { 2 } - 40 x + 20$
E) $x ^ { 2 } - 40 x + 100$