Expanding Surds and Simplifying by Boxed Rockets

Expand these brackets

4 (5 + \sqrt{6})

20 + 4 \sqrt{6}

\sqrt{6} (2 - \sqrt{5})

2 \sqrt{6} - \sqrt{30}

(4 - \sqrt{3}) (5 - \sqrt{3})

23 - 9 \sqrt{3}

(5 - \sqrt{6}) (5 + \sqrt{6})

19