Answer :

To determine the value of [tex]\(\sqrt{x - \sqrt{x}}\)[/tex] given the equation [tex]\(x^2 - 65x = 64\sqrt{x}\)[/tex], we will follow these steps:

1. Rewrite the equation in a friendly form for solving:
[tex]\[ x^2 - 65x - 64\sqrt{x} = 0 \][/tex]

2. Solve the quadratic equation in terms of [tex]\(x\)[/tex]:
[tex]\[ x = 0 \quad \text{or} \quad x = \frac{\sqrt{257}}{2} + \frac{129}{2} \][/tex]

After solving, we get two solutions:
[tex]\[ x = 0 \][/tex]
and
[tex]\[ x = \frac{\sqrt{257}}{2} + \frac{129}{2} \][/tex]

3. Consider the real solutions:
- For [tex]\(x = 0\)[/tex]:
[tex]\[ \sqrt{0 - \sqrt{0}} = \sqrt{0} = 0 \][/tex]

Therefore, the value of [tex]\(\sqrt{x - \sqrt{x}}\)[/tex] when [tex]\(x = 0\)[/tex] is [tex]\(0\)[/tex].

- For [tex]\(x = \frac{\sqrt{257}}{2} + \frac{129}{2}\)[/tex]:
[tex]\[ \sqrt{\left(\frac{\sqrt{257}}{2} + \frac{129}{2}\right) - \sqrt{\left(\frac{\sqrt{257}}{2} + \frac{129}{2}\right)}} \][/tex]
Upon evaluating the above expression, it simplifies to a complicated algebraic expression that is not one of the provided options:
[tex]\[ \sqrt{-\sqrt{\left(\frac{\sqrt{257}}{2} + \frac{129}{2}\right)} + \left(\frac{\sqrt{257}}{2} + \frac{129}{2}\right)} \][/tex]

From these steps and evaluating the real solutions, we find the primary candidate for the answer is when [tex]\(x = 0\)[/tex], which results in [tex]\(\sqrt{x - \sqrt{x}} = 0\)[/tex].

Thus, none of the provided options exactly match, but the closest discernible correct option given the allowable steps and constraints would be most logically formatted as:

[tex]\[ \boxed{0} \][/tex]