The expression in the image is:

$- \frac{1}{2x^{3/2}}$

Would you like me to solve or simplify this expression further? Or do you have any specific question regarding this expression?

Follow-up Questions:

1. Would you like to differentiate or integrate this expression?
2. Are you looking for a particular value of $x$ that satisfies this expression?
3. Would you like to rewrite the expression in a different form?
4. Are you interested in understanding how this expression behaves as $x$ approaches a certain value?
5. Do you need help with a related topic such as exponent rules or fraction operations?

Tip: Understanding how to manipulate expressions with fractional exponents is key in calculus, especially when dealing with derivatives and integrals.