Algebra

first, let's focus in the equation we are given. 

Squaring both sides of the equation, we get that

$(a^2 + 2 + 1/a^2) = 0$

This means that we have $a^2 + 1/a^2 = -2$

Now, let's focus on what we are trying to find. 

Let's notice that 

$a^3 - 1/a^3 = ( a - 1/a) ( a^2 + 1 + 1/a^2)$

Wait a minute! we already have all the terms needed. We know both values to solve the problem. 

Since the first term is 0, we just have $(0)(-1) = 0$

So 0 is our answer. 

Thanks! :)