You don't. There's no question there, and nothing that needs solving.
If it were equal to something, then we could get some exercise figuring out
what number 'x' must be in order to make it true. But the way it is now, it
doesn't say anything. It's just a number that depends on what 'x' is.
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x = 1/2 [ 1 ± i sqrt(7) ]
You have to put your heart into it!
If x squared -10 = 0 then x = the square root of 10
The question contains an expression, not an equation or inequality. There is nothing to solve in an expression.
Solve using the quadratic formula