An expression represents a rational number if the simplified result yields a number of the form where p and q are integers and
A square root is rational only if the expression in the radical simplifies to a perfect square. Thusmust 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...
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