It looks like you've provided a quadratic expression:

$x^2 + 4x$

Would you like to factor it, find its roots, complete the square, or perform another operation?

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Let me know if you'd like details on any steps or further clarification. Here are some related questions for more practice:

1. How can you factor the expression $x^2 + 4x$?
2. How would you complete the square for $x^2 + 4x$?
3. What are the solutions to $x^2 + 4x = 0$?
4. How does adding a constant term affect the graph of $x^2 + 4x$?
5. What is the vertex form of $x^2 + 4x$?

Tip: For any quadratic expression $ax^2 + bx + c$, you can use the quadratic formula $x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$ to find its roots if set equal to zero.