Find three numbers to make the expression rational`sqrt(x+y+z)`

An expression represents a rational number if the simplified result yields a number of the form`p/q` where p and q are integers and `q!=0`

A square root is rational only if the expression in the radical simplifies to a perfect square. Thus`x+y+z`must add to a perfect square.

Examples include x=y=z=0

x=y=1, z=2

x=y=z=3/4

x=2,y=6,z=8

etc...