4/7 under the radical sign is equal to (4 under the radical sign)/(7 under the radical sign)

The denominator is equal to (4 under the root sign) multiplied by (7 under the root sign)/7.

Equal to (27 under the root sign)/7.

Subtracting 28 from the root sign equals (6/7) times.

7 under the root sign is equal to (12/7) times.