Question

How do you solve `x^ (-2/3) = 9`?

Answer 1

Please see below.

Explanation:

Write it as `1/((root(3)x)^2) = 9`

So `1/9 = (root(3)x)^2`

`root(3)x = +- sqrt(1/9) = +- 1/3`

`x = (+-1/3)^3 = +- 1/27`