Question

Como resolver x³- 4x =0 ?

Answer 1

x³-4x=0

x³=4x
x³/x=4

x²=4
x=±√4
x=±2

Answer 2

>> Fatorando, temos:

x³- 4x =0 
x(x²-4) = 0

x' = 0

x²-4 = 0
x =√4
x'' = -2
x''' = +2

Raízes {0,-2, 2}