Question

3 root5 +3 / root5-3

Answer 1

3√5+3/√5-3 ×√5+3/√5+3

;15+9√5+3√5+9/5-9

;24+12√5/-4
12(2+√5)/-4

;-3(2+√5)

Answer 2

your answer is
$- (6 + 3 \sqrt{5} )$