secondary 3 chevron_right A Maths chevron_right Singapore

Hi I just wanna ask for this qn the last two steps, how did sq root 2-2 in the numerator switch positions to become 2-sq root 2 for the last step and likewise how did the numbers also switch positions for the denominator from 2-4 to give u 2 in the denominator in the last step ? Like what method was that