What is the second power of (Mathematics) (2 √ 3 - √ 2)?

What is the second power of (Mathematics) (2 √ 3 - √ 2)?

solution
(2√3-√2)²
=(2√3)²-2×√2×2√3+(√2)²
=12-4√6+2
=14-4√6
Application formula
(a-b)²=b²+a²-2ab