What are the solutions to the equation?
4x^3 = 405x divide both sides by 5
x^3 = 81x subtract 81x from both sides
x^3 - 81x = 0 factor
x ( x^2 - 81) = 0
x (x - 9) (x + 9) = 0 and we can write this as
(x - 0 ) ( x - 9) ( x + 9 ) = 0
The solutions are
0, 9, -9
