The expression you've provided appears to be:

$3x + \sqrt{3x^3 - 26x^2 + 3x + 4}$

This is a combination of a linear term $3x$ and a square root of a cubic polynomial $3x^3 - 26x^2 + 3x + 4$. There's not much simplification to be done unless you're solving for $x$ or differentiating/integrating the expression.

Do you want to:

1. Simplify further?
2. Solve for specific values of $x$?
3. Differentiate with respect to $x$?
4. Integrate with respect to $x$?
5. Factor the cubic polynomial under the square root?

Tip:

When dealing with expressions containing square roots, check if the polynomial inside the root can be factored to simplify the expression further.