The expression $x^2 + 4x + 4$ is a quadratic expression. Let's solve it by factoring.

The expression can be rewritten as:

$x^2 + 4x + 4 = (x + 2)(x + 2) = (x + 2)^2$

Thus, the factored form is $(x + 2)^2$.

If you were solving $x^2 + 4x + 4 = 0$, the solution would be:

$(x + 2)^2 = 0 \implies x = -2$

Let me know if you would like any further explanation!

Related questions:

1. How do you solve a quadratic equation by completing the square?
2. What is the quadratic formula and when should it be used?
3. How do you find the vertex of a quadratic function?
4. What is the significance of the discriminant in a quadratic equation?
5. How does factoring relate to finding the roots of a quadratic equation?

Tip: Always check if a quadratic expression can be factored before using the quadratic formula. This can save time!