Solve for x:
x^3 + 4 x = 4 x^2
Subtract 4 x^2 from both sides:
x^3 - 4 x^2 + 4 x = 0
Factor x from the left hand side:
x (x - 2)^2 = 0
Split into two equations:
(x - 2)^2 = 0 or x = 0
Take the square root of both sides:
x - 2 = 0 or x = 0
Add 2 to both sides:
Answer: | x = 2 or x = 0
