How do i solve this math problem? ?

Question

Simplify the expression. rationalize the denominator when necessary.

1. 3√7/12 [three square root of seven-twelves]

Answer 1

3√(7/12) = 3√([7*3/(12*3)]

= 3√(21/36)

= 3√21/√36

= 3√21 / 6

= ½√21