The expression shown in the image is $\sqrt{-10}$. This is the square root of a negative number, which means the solution involves imaginary numbers.

To simplify $\sqrt{-10}$:

$\sqrt{-10} = \sqrt{-1 \times 10} = \sqrt{-1} \times \sqrt{10} = i \times \sqrt{10}$

So, the simplified form of $\sqrt{-10}$ is:

$i\sqrt{10}$

Where $i$ is the imaginary unit, defined as $i = \sqrt{-1}$.

Would you like more details or have any questions?

Here are 5 related questions for further practice:

1. What is $\sqrt{-25}$?
2. How do you simplify $\sqrt{-36}$?
3. What is the value of $i^2$ in complex numbers?
4. How do you add $\sqrt{-9}$ and $\sqrt{-4}$?
5. What is the simplified form of $\frac{\sqrt{-20}}{2}$?

Tip: When working with square roots of negative numbers, always remember that they result in imaginary numbers, involving the unit $i$.