Meed help with square root

[clarkm.60]

Hi! I need help with solving this problem: 3+4i divided by 5-9i?

 

[pka]

Hi! I need help with solving this problem: 3+4i divided by 5-9i?

May I ask? What does this have to do with square roots?

\(\displaystyle \dfrac{z}{w} = \dfrac{{z \cdot \overline w }}{{{{\left| w \right|}^2}}}\)

\(\displaystyle \dfrac{{a + bi}}{{c + di}} = \dfrac{{(a + bi)(c - di)}}{{{c^2} + {d^2}}}\)