Question

x3-9x=0 resolva a equacao

Answer 1

x³ - 9x = 0
x.(x²-9) = 0
x = 0
x²-9 =0
(x+3).(x-3) = 0
x+3 = 0 --> x = -3
x-3 = 0 --> x = 3
S: {0; 3; -3}