turkey-yks 2013 Q1

turkey-yks · Other · lys1-math Indices and Surds Solving Exponential or Index Equations
$$\left( 1 - 3 ^ { - 1 } + a ^ { - 1 } \right) ^ { - 3 } = 8$$
Given this, what is a?
A) $- 6$
B) $- 4$
C) $\frac { - 2 } { 3 }$
D) $\frac { 3 } { 4 }$
E) $\frac { 1 } { 6 }$
$$\left( 1 - 3 ^ { - 1 } + a ^ { - 1 } \right) ^ { - 3 } = 8$$

Given this, what is a?\\
A) $- 6$\\
B) $- 4$\\
C) $\frac { - 2 } { 3 }$\\
D) $\frac { 3 } { 4 }$\\
E) $\frac { 1 } { 6 }$