How to calculate the square root of 24-12 √ 3 is √ 6 (√ 3-1),

How to calculate the square root of 24-12 √ 3 is √ 6 (√ 3-1),


24-12√3
=18-12√3+6
=(√18)^2-2√108+(√6)^2
=(√18-√6)^2
=(√6(√3-1))^2