Zero, unless you're talking about tricky negative computations and/or the concept of infinite as well.
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Let x = the number x^2 + x = x x^2 = 0 x = 0
There is no such number.
That's not even a question. It's only a statement that says that some number is equal to itself.
that is the square root of 60 which is not an integer. It is about 7.746
0 and 1. 1x1 = 1. The answer is itself!