Until you have a value for x, the square root can only be indicated.

√(x^2 - 4)

If you mean (√x^2) - 4, that can be written as (±x - 4).

√(x^2 - 4)

If you mean (√x^2) - 4, that can be written as (±x - 4).

√(x^2 - 4)

If you mean (√x^2) - 4, that can be written as (±x - 4).

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