If you are studying complex numbers, then you know that for all numbers \(\displaystyle z~\&~w\):
the triangle inequality holds \(\displaystyle |z+w|\le|z|+|w|\),
\(\displaystyle |z^3|=|z|^3\), and \(\displaystyle \left|\dfrac{1}{w}\right|=\dfrac{1}{|w|}(w\ne 0)\).
By using those simple properties we can get your result.

If you are studying complex numbers, then you know that for all numbers \(\displaystyle z~\&~w\):
the triangle inequality holds \(\displaystyle |z+w|\le|z|+|w|\),
\(\displaystyle |z^3|=|z|^3\), and \(\displaystyle \left|\dfrac{1}{w}\right|=\dfrac{1}{|w|}(w\ne 0)\).
By using those simple properties we can get your result.