Question 4 - A-Level Maths

Expand and simplify \(( 7 - 2 \sqrt { 3 } ) ^ { 2 }\).
Express \(\frac { 20 \sqrt { 6 } } { \sqrt { 50 } }\) in the form \(a \sqrt { b }\), where \(a\) and \(b\) are integers and \(b\) is as small as possible.