Rewrite the equation by completing the square.

x² + 4x = 0

(x+2) ^2 = 4

Step-by-step explanation:

x² + 4x = 0

Take the coefficient of the x term

4

Divide by 2

4/2 = 2

Square it

2^2 = 4

Add this to each side

x^2+4x+4 = 0+4

(x+4/2) ^2 = 4

(x+2) ^2 = 4