Question

Simplify the following expression. 1/z^-3

Answer 1

1/ z^-3
1 x z^3
z^3
done

Answer 2

`(1)/(z^(-3))`
Multiply numerator and denominator by z^3:

`(1)/(z^(-3))=(1)/(z^(-3))*(z^(3))/(z^(3))=(z^(3))/(1)=z^(3)`