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Answer:
x = 0
x = 2
x = -2
Step-by-step explanation:
f(x) = [tex]x^{3}[/tex] - 4x
Factor
f(x) = x ( [tex]x^{2}[/tex] - 4)
f(x) = x ( ( x - 2 ) ( x + 2 ) )
zeros;
x = 0
x = 2
x = -2