Solve the Equation by Completing the Square $$a ^ { 2 } - 10 a + 9 = 0$$

Multiple Choice

Solve the equation by completing the square.
- $$a ^ { 2 } - 10 a + 9 = 0$$

A) $- 9 , - 1$
B) 8,1
C) $\sqrt { 9 } , - \sqrt { 9 }$
D) 9,1