Use the quadratic formula to solve the equation. \[ x^{2}+4 x+4=0 \]

Step 1 ：The given equation is \(x^{2}+4 x+4=0\).

Step 2 ：We can solve this equation using the quadratic formula, which is \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\).

Step 3 ：In this equation, \(a = 1\), \(b = 4\), and \(c = 4\).

Step 4 ：Substitute these values into the quadratic formula to find the solutions for \(x\).

Step 5 ：The discriminant \(D = b^2 - 4ac = 0\).

Step 6 ：Since the discriminant is 0, the equation has one unique solution.

Step 7 ：The solution is \(x = -2\).

Step 8 ：Final Answer: \(\boxed{-2}\)