It's an equation. Specifically, in 3 dimensions it's the equation of a right cone centered on the origin.
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It equals 0. * * * * * Unless the question is (-x)2 + (+x)2. In that case, the answer is 2x2
Try -1. x=1, x=-6
If: y2+x2 = 52 Then: x2 = 52-y2 Their values could be: x = 3 and y = 4
There are an infinite number of different quantities to which it could be equal, depending on what the value of 'X' happens to be at the moment.