Hello AquafinaNote that we have just even powers of and , so the graph is symmetrical about both axes. If we re-arrange:

Note that whenever is real, so is real.

Then is real whenever

i.e. or .

These give approximate values of and .

By the symmetry of the equation, has the same ranges of values.

So the graph consists of four non-overlapping loops as in the attached sketch.

Grandad