Question

√72 - ( 2√6 - 4√3)*√3

Answer 1

$sqrt{72} -(2 sqrt{6}-4 sqrt{3} ) *sqrt{3} = sqrt{36*2} -(2 sqrt{18}-12 ) =\ \ =6 sqrt{2}-2 sqrt{9*2}+12= 6 sqrt{2}-6sqrt{2}+12=12$

Answer 2

√72-(2√6-4√3)*√3=√36*2-(6-36)=√36*√2-30=-24√2