Answer :

To rewrite the expression

[tex]\[ \frac{1}{x^{-\frac{3}{6}}} \][/tex]

in its simplest radical form, we should simplify and manipulate the expression step-by-step.

### Step 1: Simplify the Exponent
The exponent [tex]\(-\frac{3}{6}\)[/tex] can be simplified.

Simplifying the fraction [tex]\(-\frac{3}{6}\)[/tex] we get:

[tex]\[ -\frac{3}{6} = -\frac{1}{2} \][/tex]

Thus,

[tex]\[ x^{-\frac{3}{6}} = x^{-\frac{1}{2}} \][/tex]

### Step 2: Invert the Expression using the Negative Exponent Rule
Recall the rule that states [tex]\( x^{-a} = \frac{1}{x^a} \)[/tex]. Applying this rule, we get:

[tex]\[ x^{-\frac{1}{2}} = \frac{1}{x^{\frac{1}{2}}} \][/tex]

### Step 3: Substitute back into the original expression
Substituting [tex]\( x^{-\frac{1}{2}} \)[/tex] into the original fraction, we have:

[tex]\[ \frac{1}{x^{-\frac{1}{2}}} = \frac{1}{ \frac{1}{x^{\frac{1}{2}}} } \][/tex]

### Step 4: Simplify the Fraction
Simplifying the compound fraction [tex]\(\frac{1}{ \frac{1}{x^{\frac{1}{2}}} }\)[/tex], we get:

[tex]\[ \frac{1}{ \frac{1}{x^{\frac{1}{2}}} } = x^{\frac{1}{2}} \][/tex]

### Step 5: Convert to Radical Form
The exponent [tex]\(\frac{1}{2}\)[/tex] can be rewritten in radical form. Recall that:

[tex]\[ x^{\frac{1}{2}} = \sqrt{x} \][/tex]

Thus,

[tex]\[ x^{\frac{1}{2}} = \sqrt{x} \][/tex]

### Conclusion
So, the simplest radical form of the expression

[tex]\[ \frac{1}{x^{-\frac{3}{6}}} \][/tex]

is

[tex]\[ \sqrt{x} \][/tex]