Question

Can anyone explain what is written in the box ?

Answer 1

In the box

someone has compared

L.H.S TO R.H.S

In LHS

(12+5√6)/6 IS GIVEN

so in RHS WE HAVE TAKEN

A number

in the same form as (12+5√6)/6

which is

a-b√6

now, comparing the terms on both sides

the term which looks like "a" in LHS

is 12/6

and like -b√6 is (5/6)√6

so b=-5/6

and a=12/6