How does (5√26)/2 equal 5√(13/2). Need explaining

Answer 1

5√(13/2)
= 5√13/√2
= 5√13/√2) * √2/√2
= 5√26/2

test with a calculator

Answer 2

You show how from 13 to 26. I want to know how from 26 to13

Answer 3

so follow the steps backwards
geez