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For the entire radical v90x^2 , state the restriction on the variable. Then express each as a mixed radical?

I'm guessing that there is no restriction because the expression is positive? I'd appreciate any steps for clear understanding
Thanks in advance

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Richard P. | Fairfax County Tutor for HS Math and ScienceFairfax County Tutor for HS Math and Sci...
4.9 4.9 (637 lesson ratings) (637)
    Assuming that the expression is sqrt(90 x2),
the usual  mixed radical form is   3 x sqrt(10)
For this form the restriction is x ≥ 0.          The entire and mixed expressions do not evaluate to the same value if  x is negative. 
However, we can also write the mixed radical as   3 |x| sqrt(10) .   Written this way there is no restriction.