Solve the Equation $81 a ^ { 2 } - 180 a + 100 = 0$

Multiple Choice

Solve the equation. $81 a ^ { 2 } - 180 a + 100 = 0$

A) $\left\{ - \frac { 10 } { 9 } \right\}$
B) $\left\{ \frac { 10 } { 9 } , \frac { 9 } { 10 } \right\}$
C) $\left\{ \frac { 10 } { 9 } \right\}$
D) $\left\{ \frac { 9 } { 10 } \right\}$
E) none of these