Rewrite the equation by completing the square.

x^2 - 4x = 0

Step-by-step explanation:

x² - 4x = 0

To complete the square, take half of the second coefficient, square it, then add the result to both sides.

(-4/2) ² = 4

x² - 4x + 4 = 4

(x - 2) ² = 4

x - 2 = ±2

x = 2 ± 2

x = 0 or 4